Discussed what young lady consumed on the day (7)
I believe the answer is:
debated
'discussed' is the definition.
(debating is a kind of discussing)
'young lady consumed on the day' is the wordplay.
'young lady' becomes 'deb' (short for debutante).
'consumed' becomes 'ate' (to eat is to consume food).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the day' becomes 'd' (abbreviation for day).
'deb'+'ate'+'d'='DEBATED'
'what' is the link.
(Other definitions for debated that I've seen before include "Shared opinions" , "Argued" , "Discussed formally" , "Discussed in public" , "Considered" .)