Crossword Genius

Boozy insomniac's favourite birds? (9)

Ross

I believe the answer is:

nightjars

I'm a little stuck... Click here to teach me more about this clue!

'birds?' is the definition.
(nightjar is a kind of bird)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for nightjars that I've seen is " Birds".)

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