Fender bender (4)
I believe the answer is:
dent
'fender bender' 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 "Depression caused by blow" , "'Dinge, depression (4)'" , "Hollow caused by a blow" , "Surface hollow" , "tooth (13) [FRENCH]" .)