Drunkard in this place making childish remark (2,5)
I believe the answer is:
so there
'remark' is the definition.
(I have seen 'Defiant remark' mean 'so there' so perhaps 'remark' could also mean 'so there')
'drunkard in this place making childish' is the wordplay.
I cannot really understand how this works, but
'drunkard' could be 'sot' (sot can mean a drunken person) and 'sot' is found within the answer.
'this place' could be 'here' (here in this location) and 'here' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for so there that I've seen before include "Expression of defiance" , "Derisive expression" , "Defiant words" , "That will teach you!" , "Triumphant put-down" .)