Animal engaged in eating nuts (3)

I believe the answer is:

gnu

'animal' is the definition.
(type of antelope)

'engaged in eating nuts' is the wordplay.
'engaged in' indicates a hidden word.
'GNU' is hidden in the letters of 'eating nuts'.

(Other definitions for gnu that I've seen before include "Literally wild beast" , "Creature" , "hitherto unknown, we hear" , "Gun to get antelope" , "Large heavy antelope" .)

I've seen this clue in the Evening Standard.

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