Drunk now and you can't do anything about it! (2,5)
I believe the answer is:
so there
'you can't do anything about it' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'drunk now' is the wordplay.
'drunk' becomes 'sot' (both can mean someone who drinks too much).
'now' becomes 'here' (I've seen this in other clues).
'sot'+'here'='SO THERE'
'and' is the link.
Can you help me to learn more?
(Other definitions for so there that I've seen before include "What are you going to do about that" , "Defiant statement" , "Expression of triumph, derision, etc" , "That will teach you!" , "Tough!" .)