Collision from parking next to Sierra? Almost (5)
I believe the answer is:
prang
'collision' is the definition.
(I've seen this before)
'parking next to sierra? almost' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'next to' is a charade indicator (letters next to each other).
'sierra?' becomes 'range' (sierra is a kind of range).
'almost' means to remove the last letter (most of the word but not all of it).
'range' with its last letter taken off is 'rang'.
'p'+'rang'='PRANG'
'from' acts as a link.
(Other definitions for prang that I've seen before include "Popularly, a motoring contretemps" , "Crash (informal)" , "Car accident, usually not too serious" , "Plane or car crash" , "damage" .)