The curve where the car crashed (3)
I believe the answer is:
arc
'the curve' is the definition.
(arc is a kind of curve)
'the car crashed' is the wordplay.
'crashed' indicates an anagram.
'car' with letters rearranged gives 'ARC'.
'where' is the link.
(Other definitions for arc that I've seen before include "Electric discharge" , "be rapidly discharged" , "development of plot" , "Something used to weld" , "Part of curved line" .)