Crossword Genius

As used in shooting at gangsters? (3)

Ross

I believe the answer is:

gat

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'as' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'in shooting at gangsters?' is the wordplay.
'in' indicates a hidden word.
'GAT' can be found hidden inside 'shooting at gangsters'.

'used' is the link.

Can you help me to learn more?

(Other definitions for gat that I've seen before include "Slang for a gangster's pistol" , "Gangster's gun" , "in Indian music, the last bit of raga" , "Revolver (informal)" , "Piece" .)

I've seen this clue in the Evening Standard.
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