Fastener for broken petals (6)
I believe the answer is:
staple
'fastener' is the definition.
(I know that staple is a type of paper fastener)
'broken petals' is the wordplay.
'broken' indicates anagramming the letters.
'petals' anagrammed gives 'STAPLE'.
'for' acts as a link.
(Other definitions for staple that I've seen before include "Clip" , "Paper-fastening device" , "Short U-shaped paper fastener" , "key" , "A wire paper fastener for plates" .)