Admires spray gun (7)

I believe the answer is:

sidearm

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

'spray gun' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'admires' is the wordplay.
'admires' can be anagrammed to 'SIDEARM'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sidearm that I've seen before include "Piece" , "One may be fired" , "Officer may carry this" , "weapon" .)

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

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