Snap audibly "It's a bay!" (5)

I believe the answer is:

bight

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'it's a bay' is the definition.
(bight is a kind of bay)

I can't explain the remainder of the clue.

(Other definitions for bight that I've seen before include "Wide bay" , "bend in river" , "Curve of shore" , "Bay, sounds like a morsel of food" , "Coastline curve forming a bay" .)

I've seen this clue in the Evening Standard.

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