Loco, a flier? (6)

I believe the answer is:

cuckoo

I believe this clue is a double definition.

'loco' is the first definition.

'a flier?' is the second definition.
(cuckoo is a kind of birdanimal)

(Other definitions for cuckoo that I've seen before include "Bats" , "Crackpot bird?" , "building no nest?" , "Bananas" , "Out to lunch" .)

I've seen this clue in The Times.

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