Sneering expression at this point on drunk (2,5)
I believe the answer is:
so there
'sneering expression' is the definition.
'this point on drunk' is the wordplay.
'this point' becomes 'here' (I've seen this in other clues).
'on' is a charade indicator (letters next to each other).
'drunk' becomes 'sot' (synonyms).
'here' after 'sot' is 'SO THERE'.
'at' is the link.
(Other definitions for so there that I've seen before include "Defiant remark" , "message of defiance" , "defiant expression" , "Derisive expression" , "Triumphant put-down" .)