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Harsh name for a bird (7)


I believe the answer is:


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This clue might be a double definition.

'harsh name' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'a bird' is the second definition.
(bittern is a kind of bird)

'for' acts as a link.

Can you help me to learn more?

(Other definitions for bittern that I've seen before include "'He shall not hear the . . . cry' (Ledwidge)" , "Source of boom" , "flier" , "Marsh bird of the heron family" , "Marshland bird" .)

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