Large heavy antelope (3)

I believe the answer is:

gnu

'large heavy antelope' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for gnu that I've seen before include "Gun for a kind of deer" , "Animal" , "Literally wild beast" , "Large heavy antelope" , "Wildebeest" .)

I've seen this clue in The Irish Times.

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