The meal's about to be finished (6)
I believe the answer is:
repast
'the meal's' is the definition.
(repast can mean a meal)
'about to be finished' is the wordplay.
'about' becomes 're' (regarding).
'to be finished' becomes 'past' (I've seen this in another clue).
're'+'past'='REPAST'
(Other definitions for repast that I've seen before include "A meal concerning time gone by" , "Feast, meal" , "Prates about meal" , "Banquet" , "A formal sort of meal" .)