Hawaiian goose which can be seen at the Slimbridge wildlife reserve (4)

I believe the answer is:

nene

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'hawaiian goose' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for nene that I've seen before include "Peterborough's river" , "Rare bird" , "Northants river" , "Flower" , "River navigable to Northampton" .)

I've seen this clue in The Times.

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