Crossword Genius

Undistinguished types man such a ship? (4-5)

Ross

I believe the answer is:

twin-screw

I'm a little stuck... Click here to teach me more about this clue!

'a ship?' is the definition.

'undistinguished types man' is the wordplay.
'undistinguished types' becomes 'twins' (I am not sure about this - if you are sure you should believe this answer much more).
'man' becomes 'crew' (crewing is a kind of manning).
'twins'+'crew'='TWIN-SCREW'

'such' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app