Triple zero? Shotgun fired! (7)

I believe the answer is:

noughts

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'triple zero? shotgun fired' is the definition.
I can't tell whether this definition defines the answer.

'shotgun fired' is the wordplay.
'fired' indicates an anagram (letters fired up or animated).
'shotgun' with letters rearranged gives 'NOUGHTS'.

Can you help me to learn more?

(Other definitions for noughts that I've seen before include "Game played with pencil and paper" , "More than once, zero" , "- - and crosses" , "Zeros" , "Zeroes" .)

I've seen this clue in the Sydney Morning Herald.

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