Crossword Genius

Rear parking collision (4)

Ross

I believe the answer is:

bump

'collision' is the definition.
(I've seen this before)

'rear parking' is the wordplay.
'rear' becomes 'bum' (synonyms).
'parking' becomes 'p' (abbreviation on road signs).
'bum'+'p'='BUMP'

(Other definitions for bump that I've seen before include "Jolting movement or skin swelling" , "Prang" , "Impact injury" , "Thud down, into" , "Slang for kill - . . . . off" .)

I've seen this clue in the Sydney Morning Herald.
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