Defiant remark from drunk present (2,5)
I believe the answer is:
so there
'defiant remark' is the definition.
(I've seen this before)
'drunk present' is the wordplay.
'drunk' becomes 'sot' (sot can mean a drunken person).
'present' becomes 'here' (both can mean in attendance).
'sot'+'here'='SO THERE'
'from' acts as a link.
(Other definitions for so there that I've seen before include "Triumphant put-down" , "I defy you" , "Defiant remark" , "That will teach you!" , "defiant expression" .)