Bit of hail damage (4)
I believe the answer is:
dent
'bit of hail damage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dent that I've seen before include "Slight damage" , "tooth (13) [FRENCH]" , "Slight hollow" , "Hollow, depression" , "Small hollow" .)