El Ghanassy signed from AA Gent on a season-long loan.
"I said when we signed Yassine that he was one to develop, nurture and bring through," Clarke told the WBA website.
"Until now we have done that quite well.
"He played at Yeovil in the Capital One Cup and he put in a decent performance.
"He's been training well and I was saying to him last week that he's working better now than he was in pre-season when he was taking part in some of the pre-season games.
"And his time will come. Whether it comes quickly or a little bit later I can't tell because circumstance will dictate that."