Hollow bit with cutting edges (7)
I believe the answer is:
dentate
'hollow bit with cutting edges' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?
'hollow bit' is the wordplay.
'hollow' becomes 'dent' (both can mean an impression or indentation).
'bit' becomes 'ate' ('bite' can be similar in meaning to 'eat').
'dent'+'ate'='DENTATE'
Can you help me to learn more?
(Other definitions for dentate that I've seen before include "like certain leaves" , "Having a tooth-like edge - ante Ted (anag)" , "Toothed" , "with teeth" .)