Crossword Genius

Weapon made sir nasty (7)

Ross

I believe the answer is:

sidearm

'weapon' is the definition.
(I've seen this before)

'made sir nasty' is the wordplay.
'nasty' is an anagram indicator.
'made'+'sir'='madesir'
'madesir' with letters rearranged gives 'SIDEARM'.

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

I've seen this clue in The Telegraph.
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