Crossword Genius

A gun could get it beastly upset! (3)

Ross

I believe the answer is:

gnu

I'm a little stuck... Click here to teach me more about this clue!

'it beastly upset' is the definition.
The definition suggests a singular noun which matches the answer.

'a gun could' is the wordplay.
'gun' anagrams to 'GNU'.
However, I'm unsure how the anagram is indicated.

'get' acts as a link.

Can you help me to learn more?

(Other definitions for gnu that I've seen before include "Wildebeest" , "Strange gun for an antelope" , "animals" , "Animal" , "Antelope sounds as if it has knowledge" .)

I've seen this clue in the Evening Standard.
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