Bone cleaner's handy weapon (13)

I believe the answer is:

knuckleduster

'handy weapon' is the definition.

'bone cleaner's' is the wordplay.
'bone' becomes 'knuckle'.
'cleaner' becomes 'duster' (I've seen this before).
'knuckle'+'duster'='KNUCKLEDUSTER'

(Another definition for knuckleduster that I've seen is " Illegal hand weapon".)

I've seen this clue in The Guardian.

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