Crossword Genius

Birds used big nuts (7)

Ross

I believe the answer is:

budgies

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

'used big nuts' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'used'+'big'='usedbig'
'usedbig' is an anagram of 'BUDGIES'.

(Another definition for budgies that I've seen is " Small parakeets".)

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