Sorry but Clarke's injury prior to the game was a torn hamstring, which has recovered, he has hurt his back this time different injury / symptoms. His back is dodgy, and will never be fine, so based on this he should not of played any tests as his back is always about to give out.
But on a different note, please drop Watson, 2 singles in 30 odd balls. That is not how a top order batsmen should play, bring back Usman at 3.