Space to manoeuvre in a ship's cabin? (3,4)
I believe the answer is:
sea room
'space to manoeuvre' is the definition.
(I've seen this before)
'ship's cabin?' is the wordplay.
'ship's' becomes 'sea' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cabin?' becomes 'room' (cabin is a kind of room).
'sea'+'room'='SEA-ROOM'
'in a' acts as a link.
Can you help me to learn more?
(Other definitions for sea room that I've seen before include "required for naval manoeuvres" , "Space to manoeuvre" .)