Crossword Genius

One of the birds or bats (6)

Ross

I believe the answer is:

cuckoo

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'bats' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for cuckoo that I've seen before include "Bird (with a bad reputation)" , "nuts" , "Hourly you might hear this" , "Slightly mad - bird" , "Bird which lays eggs in others' nests" .)

I've seen this clue in The Times.
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