Does his chest look inflamed? (5)

I believe the answer is:

robin

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'does his chest look inflamed?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for robin that I've seen before include "Batman's assistant" , "Small songbird" , "Batman's companion" , "Bird; man's name" , "Friendly winter bird" .)

I've seen this clue in the Evening Standard.

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