Without one, coaches left ship (9)
I believe the answer is:
transport
'ship' is the definition.
(transport ship is a kind of ship)
'without one coaches left' is the wordplay.
'without' suggests deleting specific letters.
'one' becomes 'i' (Roman numeral).
'coaches' becomes 'train' (I've seen this before).
'left' becomes 'sport' (I can't explain this - if you can you should give a lot more credence to this answer).
'train' with 'i' removed is 'tran'.
'tran'+'sport'='TRANSPORT'
Can you help me to learn more?
(Other definitions for transport that I've seen before include "Move something or someone over a distance" , "Bear" , "Convey - delight" , "Send (convict) to a penal colony" , "Overwhelm with joy" .)