Vessel unsuitable for batter! (7)
I believe the answer is:
pitcher
'vessel' is the definition.
(I know that pitcher is a type of vessel)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pitcher that I've seen before include "Earthenware vessel" , "that can hold his drink" , "large vessel" , "Vessel with a handle and spout" , "source of drink?" .)