Piece of bread the French break into bits (7)
I believe the answer is:
crumble
'break into bits' is the definition.
(I've seen this in another clue)
'piece of bread the french' is the wordplay.
'piece of bread' becomes 'crumb'.
'the french' becomes 'le' ('the' in French).
'crumb'+'le'='CRUMBLE'
(Other definitions for crumble that I've seen before include "Break up - pudding" , "(To) fragment; pudding" , "Fall to bits; a pudding" , "Break up - fruit dish" , "Break into small fragments" .)