The America's Cup, for one (4)
I believe the answer is:
ewer
'the america's cup for one' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ewer that I've seen before include "Were (anag)" , "Open vessel with handle and spout" , "A wide-lipped jug" , "Large, wide-mouthed jug" , "Large pitcher" .)