Prang rear end of jeep (4)
I believe the answer is:
bump
'prang' is the definition.
(I've seen this before)
'rear end of jeep' is the wordplay.
'rear' becomes 'bum' ('bum' can be a synonym of 'rear').
'end of' says to take the final letters.
The last letter of 'jeep' is 'p'.
'bum'+'p'='BUMP'
(Other definitions for bump that I've seen before include "Slight collision" , "Lump caused by a blow" , "Knock - collide" , "Light blow or jolting collision" , "Bounce" .)