Room on the vesel for a vehicle (9)
I believe the answer is:
'for a vehicle' is the definition.
(spaceship is a kind of vehicle)
'room on the vesel' is the wordplay.
'room' becomes 'space' (I've seen this in another clue).
'on' means one lot of letters go next to another.
'the vesel' becomes 'ship' (I can't justify this - if you can you should give a lot more credence to this answer).
Can you help me to learn more?
(Other definitions for spaceship that I've seen before include "Craft to travel outside the Earth's atmosphere" , "orbiter, perhaps" , "long-distance traveller?" , "long-distance vessel" , "craft going far?" .)