Goes on stage (6)
(Other definitions for boards that I've seen before include "Puts up" , "Adsorb (anag)" , "Committees or planks" , "panels" , "Theatre stages" .)
'goes on stage' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enters that I've seen before include "Comes in" , "Registers for a competition, say" , "Goes inside" , "Records, in a diary say" , "Goes in or records in book" .)