Provides meals as support for actors (6)
I believe the answer is:
boards
'provides' is the definition.
(boarding is a kind of providing)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for boards that I've seen before include "Gets on; the stage (colloq.)" , "sections of timber" , "Actors are said to tread them" , "Theatre stages" , "panels" .)