Some flexible tiles flipping crack (5)
I believe the answer is:
elite
'crack' is the definition.
(I've seen this in another clue)
'some flexible tiles flipping' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'flipping' is a reversal indicator.
'etile' is hidden in the letters of 'flexible tiles'.
'etile' back-to-front is 'ELITE'.
(Other definitions for elite that I've seen before include "one of the letter sizes" , "Aristocratic" , "type in pool?" , "Cream, the pick" , "twelve pitch in the office" .)