Current ruptures your once capsized boat (5)
I believe the answer is:
yacht
'boat' is the definition.
(yacht is a type of boat)
'current ruptures your once capsized' is the wordplay.
I cannot really see how this works, but
'current' could be 'ac' (alternating current) and 'ac' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for yacht that I've seen before include "Light, fast sailing-vessel" , "Cathy (anag.)" , "Kind of boat" , "Luxury purchase" , "Pleasure-boat" .)