A vessel to push, roughly? (5)
I believe the answer is:
barge
This might be a double definition.
'a vessel' is the first definition.
(barge is a kind of vessel)
'push roughly?' is the second definition.
'barge' can be an answer for 'push' (I've seen this before). I'm not sure about the 'roughly?' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for barge that I've seen before include "Canal-boat" , "Long boat for freight" , "Canal boat, towed along (5)" , "Roughly push one's way" , "Move forcefully" .)