He goes to jug for drinking (4)
I believe the answer is:
toby
This clue could be a double definition.
'he goes' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'jug for drinking' is the second definition.
'toby' can be an answer for 'jug' (I've seen this before). I'm not certain of the 'for drinking' bit.
'to' is the link.
Can you help me to learn more?
(Other definitions for toby that I've seen before include "Member of the 12 [SHANDY] family" , "Mr Punch's dog, beer-jug" , "Kind of jug" , "This Jug is like man with three-cornered hat" , "dog with frill round neck" .)