Sailor used weapon twisted round (4-6)

I believe the answer is:

jack-knifed

'twisted round' is the definition.

'sailor used weapon' is the wordplay.
'sailor' becomes 'jack' (I've seen this before).
'used weapon' becomes 'knifed'.
'jack'+'knifed'='JACK-KNIFED'

I've seen this clue in The Times.

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