Concerning former meal (6)
I believe the answer is:
repast
'meal' is the definition.
(repast can mean a meal)
'concerning former' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'former' becomes 'past' (similar in meaning).
're'+'past'='REPAST'
(Other definitions for repast that I've seen before include "Food - tapers (anag)" , "Something to eat" , "A formal sort of meal" , "Prates about meal" , "Feast, meal" .)