The Baggies goalkeeper recently made himself available for selection for the Three Lions having withdrawn from contention two years ago.
Foster had found himself restricted to the fringes of the squad before citing injury complications and family reasons for his decision to drop out after the 29-year-old had earned five caps.
However, with his fitness and form stronger than ever, Foster is back in the picture and was today recalled by Roy Hodgson for England's forthcoming World Cup qualifiers against San Marino and Montenegro.
"We're all delighted for Ben," said Clarke. "He obviously made himself available for selection and he explained his reasons for pulling out initially.
"It's good. I like my players to be involved for their countries because I think it's a great honour. It was a disappointment for me that I only got to represent Scotland six times at senior level. So for the players who do get selected to play for their country, it's great.
"I'm sure he'll do well."
Foster missed several games earlier this season with a niggling groin injury but is currently in fine form having taken his time to recover.
"We think, touch wood, that Ben is in a good place physically now," said Clarke, who succeeded England coach Hodgson at The Hawthorns last summer.
"He's done a lot of work with the fitness and conditioning staff. He obviously feels in a really good place fitness-wise and I think that's important.
"I think if he'd felt there were any fitness issues, he wouldn't have come back. So the fact he's come back tells you he's in a good place physically.
"I think the fact he had two procedures earlier in the season - which went on a little bit longer than they should have done and it too him a bit longer to recover - it actually seems to have freed him up a little bit and made him more comfortable in himself. That's important, and I think you can see that in his recent performances."
Albion's superb form in the first half of this season saw them become realistic contenders for European qualification via the Premier League heading into Christmas.
However, a dreadful run of results in January saw their hopes fade and though their form has picked up recently to sit them in eighth place with 43 points, the Europa League is now a distant possibility.
The FA Cup draw last weekend means they must finish fifth to qualify, needing to overhaul the likes of Arsenal, Liverpool and Everton.
"I did say there was no point us talking about European football because the Europa League places would only come down to fifth in the league and that's what has unfolded," Clarke said.
"There are too many ifs and buts. For us it's just a matter of building on the points total we've got and we've set the players a little target of getting to 50. Hopefully we can reach that quickly and still give ourselves a few games to get beyond that.
"I would love to be involved in European competition. I think you have to be as ambitious as you can be.
"You want to be successful in every competition you enter. But it's also the case that if we can break 50 points that would also be successful."
Can't blame him for not wanting to sit on the bench when he had a young child. I hope he does well, been solid all season. I think people are being very harsh on Joe Hart at the minute though, he is still an excellent keeper.- danielrhyd