Fractures (6)
I believe the answer is:
breaks
'fractures' is the definition.
('break' can be a synonym of 'fracture')
This is all the clue.
(Other definitions for breaks that I've seen before include "Shatters" , "Snaps; holidays" , "Fractures or splits" , "Interruptions of continuity" , "Unexpected pieces of good luck in a bad streak" .)