The Baggies' 2-0 home defeat to Norwich was their third in succession after previous losses to Newcastle and Manchester City, although Albion had more than enough chances to take at least a point against the Canaries.
It also extended a longer sequence of just one win from their last nine Premier League games and leaves them just two points above the relegation zone.
West Brom's next two matches are against Cardiff and at home to Hull and Clarke has told his players they need to roll up their sleeves in order to get their season back on track.
"There is no other way," he said.
"It's been a difficult week for us. Three defeats in a week is sore, it's painful, it's hard to take but next week we have to go to Cardiff, we have to be resilient and we have to start getting points on the board.
"There is no easy solution.
"This was two teams who had not been getting the best results recently, feeling each other out. From nowhere they got that first goal, it gave them something to hang on to and set us back a bit."
That first Norwich goal came courtesy of a superb finish from Gary Hooper, who raced away from Diego Lugano - the Uruguayan defender's hesitant performance will surely have caught England manager Roy Hodgson's eye - onto a Leroy Fer pass to smash an unstoppable drive beyond Boaz Myhill.
It was the former Celtic striker's third Premier League goal, and his fifth in total, and manager Chris Hughton believes the 25-year-old is starting to find his best form after an injury-hit start to life at Carrow Road.
"He is now physically fit. As a striker, to get injured one week before the start of the season when you have just arrived makes it very difficult. But Gary is one who if we provide him with champions will score goals.
"His CV shows he is someone who is a very good finisher but of course you have to have opportunities so we have to give him a service that will allow him to do that."
A clean sheet was also more than welcome for the Canaries, who shipped five goals to a Luis Suarez-inspired Liverpool in midweek, and were handed a seven-goal drubbing by Manchester City at the start of November.
Hughton hopes his side can now find some consistency at the back.
He said: "It's a balancing act, we have brought in a few new players. During our best period last season we had a very consistent back four and midfield four.
"But we found it tough from Christmas onwards. It's something we have to work on but there is a balance between being a good team defensively and having what it takes to win games."