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