Birds in tight corsets (7)

I believe the answer is:

scoters

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

'tight corsets' is the wordplay.
'tight' is an anagram indicator (tight can mean drunk).
'corsets' anagrammed gives 'SCOTERS'.

'in' acts as a link.

(Another definition for scoters that I've seen is " Black diving ducks of northern parts".)

I've seen this clue in The Guardian.

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