9 across
Fish
kingfisher
finally
caught
in
beak
(5)
Fish kingfisher finally caught in beak (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Fish — a brill is a type of flatfish. Take beak, which gives you BILL, and insert the final letter of "kingfisher" (that's R) inside it, giving you B-R-ILL.