Managerial groups (6)
I believe the answer is:
boards
'managerial groups' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for boards that I've seen before include "Long flat pieces of wood" , "Thespians tread these planks" , "directors make them up" , "Gets on (a ship)" , "Theatre stages" .)