Bird's car stolen from roundabout (5)
I believe the answer is:
ousel
'bird's' is the definition.
(ousel is a kind of bird)
'car stolen from roundabout' is the wordplay.
'stolen from' suggests deleting specific letters.
'roundabout' becomes 'carousel' ('carousel' can be a synonym of 'roundabout').
'carousel' with 'car' removed is 'OUSEL'.
(Other definitions for ousel that I've seen before include "18's [BIRD]" , "Louse (anag.); blackbird" , "Louse turned out to be a thrush (5)." , "Archaic name for blackbird" , "Strange louse for a blackbird" .)