Albion failed to score for a third successive game, although at least they halted a run of three straight defeats and maintained their place in the Premier League's top six.
Clarke said: "I thought a draw was just about the right result. We didn't quite do enough to get the three points.
"As the home team, the onus is on us to try and win it. We tried to win it but nothing really fell for us.
"We spoke before the game about defending well, to aim for the clean sheet, which we got, which is good, because we haven't had one for a while.
"That is one positive aspect. It does stop the run of defeats which is another positive aspect and it's another point towards the totals we are trying to achieve.
"But there are not many questions to ask on that game are there!?"
Clarke admitted he had made a mistake with his 4-4-2 formation in the opening 45 minutes.
He said: "Maybe it was my fault in the first half because we went 4-4-2 and it didn't quite click.
"But when we moved back to our normal system second half (4-2-3-1) we looked a little more lively."