The former Aberdeen and Bournemouth forward withdrew from the camp for the November double-header against Moldova and Denmark that sealed Scotland's place in the World Cup play-off semi-finals after citing a calf injury.
However, the winger was pictured in training with Newcastle the same day, infuriating Clarke, who has opted to leave the 28-year-old out of his squad for the upcoming friendlies against Poland and either Wales or Austria.
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Hide AdFraser has been in superb form for the resurgent Magpies under new boss Eddie Howe and Clarke insisted the door is not closed on his return to the international fold, so long as he continues to impress at club level.
"I had a chat with Ryan," Clarke said. "There was a situation in November when Ryan didn't come with the squad but trained with his club. Ryan has apologised for that situation.
"I had a good chat with him but I've decided not to pick him in this camp.
"We've agreed that Ryan's club form will determine whether he's involved in the next camps.
"Basically it's down to Ryan on how he performs for his club."
Fraser has four goals in 22 appearances for Scotland.
On his recent form, Clarke added: "He's done well recently. I've watched him live and I've seen him.
"I had a conversation with Ryan and we are both in agreement that this is the right way forward."