Concerned with tense series of courses (6)
I believe the answer is:
repast
'series of courses' is the definition.
(repast can mean a meal)
'concerned with tense' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'tense' becomes 'past' (past tense is a kind of tense).
're'+'past'='REPAST'
(Other definitions for repast that I've seen before include "Food - tapers (anag)" , "lunch?" , "Something to eat" , "Feast, meal" , "A meal concerning time gone by" .)