Fender bender memento
I believe the answer is:
dent
'fender bender memento' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dent that I've seen before include "Tend (anag.)" , "Depression caused by blow" , "'Dinge, depression (4)'" , "Slight damage" , "Impress" .)