Brothers perhaps man such a ship (4-5)
I believe the answer is:
twin-screw
'such a ship' is the definition.
'brothers perhaps man' is the wordplay.
'brothers perhaps' becomes 'twins' (twin brothers).
'man' becomes 'crew' (crewing is a kind of manning).
'twins'+'crew'='TWIN-SCREW'
I've seen this clue in The Times.
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