As used in shooting at gangsters? (3)
I believe the answer is:
gat
'as' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'in shooting at gangsters?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GAT' can be found hidden inside 'shooting at gangsters'.
'used' acts as a 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" .)