Girl presented a note for discussion (6)
I believe the answer is:
debate
'for discussion' is the definition.
(debate is a kind of discussion)
'girl presented a note' is the wordplay.
'girl presented' becomes 'deb' (debutante, girl presented to fashionable society).
'note' becomes 'te' (musical note).
'deb'+'a'+'te'='DEBATE'
(Other definitions for debate that I've seen before include "Heated discussion" , "Contend" , "Discuss formally" , "Formal public discussion" , "Discuss with opposing arguments" .)