Crossword Genius

A piece of string, unfortunately (3)

Ross

I believe the answer is:

gun

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

'of string unfortunately' is the wordplay.
'of' indicates a hidden word.
'GUN' can be found hidden inside 'string unfortunately'.

(Other definitions for gun that I've seen before include "An offensive weapon" , "What has barrel" , "Arm" , "Hired killer" , "Rev up" .)

I've seen this clue in the Evening Standard.
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