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One flighty brute, not sick of Proust (3)

Ross

I believe the answer is:

ani

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This could be a double definition.

'one flighty brute' is the first definition.
'ani' can be an answer for 'brute' (ani is a kind of brute). I am unsure of the 'one flighty' bit.

'not sick of proust' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for ani that I've seen before include "One winged" , "Black bird" , "Tropical bird" , "Bird of the cuckoo family" , "Indigo dye." .)

I've seen this clue in The Independent.
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