Animal jumping the gun (3)

I believe the answer is:

gnu

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

'jumping the gun' is the wordplay.
'jumping' indicates anagramming the letters.
'gun' is an anagram of 'GNU'.

(Other definitions for gnu that I've seen before include "animals" , "Creature" , "Large African antelope" , "Gun for a kind of deer" , "hitherto unknown, we hear" .)

I've seen this clue in The Irish Independent.

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