Crossword Genius

Fish round Maori settlement (4)

Ross

I believe the answer is:

opah

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'fish' is the definition.
(opah is a kind of fish)

I can't explain the rest of the clue.

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(Other definitions for opah that I've seen before include "Large deep-sea fish" , "Kingfish" , "Ocean swimmer" .)

I've seen this clue in The Times and The Sunday Times.
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