Concerned with tense meal? (6)
I believe the answer is:
repast
'meal?' is the definition.
(synonyms)
'concerned with tense' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'tense' becomes 'past' (past is a kind of tense).
're'+'past'='REPAST'
(Other definitions for repast that I've seen before include "Something to eat" , "lunch?" , "Banquet" , "A formal sort of meal" , "Prates about meal" .)