Argue with a posh girl to make tea, perhaps (6)
I believe the answer is:
debate
'argue' is the definition.
(synonyms)
'with a posh girl to make tea perhaps' is the wordplay.
'with' is a charade indicator (letters next to each other).
'a posh girl' becomes 'deb' (short for debutante).
'to make tea perhaps' becomes 'ate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'deb'+'ate' is 'DEBATE'.
Can you help me to learn more?
(Other definitions for debate that I've seen before include "Public argument" , "Contend" , "Discuss; argue" , "Discuss with opposing arguments" , "Ponder" .)