Is it a draw at the marine exhibition? (7)
I believe the answer is:
tugboat
'is it a' is the definition.
I can't judge whether this defines the answer.
'draw at the marine exhibition?' is the wordplay.
'draw' becomes 'tug' (tugging is a kind of drawing).
'at' is a charade indicator (letters next to each other).
'the marine exhibition?' becomes 'boat' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tug'+'boat'='TUGBOAT'
Can you help me to learn more?
(Other definitions for tugboat that I've seen before include "Powerful vessel used to pull larger ones" , "Ship pulling a larger one" , "Vessel towing larger vessels" , "Drawing craft" , "Vessel drawing" .)