Something blown from retro car in accident (7)
I believe the answer is:
ocarina
'something blown' is the definition.
(ocarina is a kind of wind instrument)
'from retro car in accident' is the wordplay.
'from' says the answer is hidden in the clue.
'OCARINA' can be found hidden inside 'retro car in accident'.
(Other definitions for ocarina that I've seen before include "Flute-toned musical toy" , "source of music" , "Terracotta wind instr." , "Bird-shaped flute" , "Primitive wind instrument" .)