Crossword Genius

Close relatives man such a ship (4-5)

Ross

I believe the answer is:

twin-screw

'such a ship' is the definition.

'close relatives man' is the wordplay.
'close relatives' becomes 'twins'.
'man' becomes 'crew' (I've seen this before).
'twins'+'crew'='TWIN-SCREW'

I've seen this clue in The Times.
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