Argue what young lady consumed (6)
I believe the answer is:
debate
'argue' is the definition.
(synonyms)
'young lady consumed' is the wordplay.
'young lady' becomes 'deb' (short for debutante).
'consumed' becomes 'ate' (to eat is to consume food).
'deb'+'ate'='DEBATE'
'what' acts as a link.
(Other definitions for debate that I've seen before include "Discuss with opposing arguments" , "consideration" , "Ponder" , "Verbal disputation" , "Public argument" .)