Not wanting a drink (4)
I believe the answer is:
agin
'not' is the definition.
I know nothing about this answer so I can't tell whether this works.
'wanting a drink' is the wordplay.
'wanting' says to put letters next to each other.
'drink' becomes 'gin' (gin is a kind of drink).
'a'+'gin' is 'AGIN'.
Can you help me to learn more?
(Other definitions for agin that I've seen before include "Opposed to local" , "Hostile to" , "Not in favour of" , "Not a fan of" , "Against (facetious)" .)