Bird makes car leave the roundabout (5)

I believe the answer is:

ousel

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'bird' is the definition.
(ousel is a kind of bird)

I don't understand the remainder of the clue.

(Other definitions for ousel that I've seen before include "Singer" , "Bird similar to blackbird" , "Dark-faced type of yore" , "Old name for a blackbird; also a kind of thrush" , "Thrush from Seoul, strangely" .)

I've seen this clue in The Guardian.

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