15 across
Small
bird
found
in
whiskey
barrel
at
sea
(7)
Small bird found in whiskey barrel at sea (7)
hints
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The definition is at the beginning of the clue.
How the clue works
The definition is Small bird. W comes from whiskey in the NATO alphabet, then "at sea" signals an anagram of BARREL, giving you ARBLER — put them together and there's your answer.