Gets on committees (6)
I believe the answer is:
boards
I believe this is a double definition.
'gets on' is the first definition.
('board' can be a synonym of 'get on')
'committees' is the second definition.
(board is a kind of committee)
(Other definitions for boards that I've seen before include "directors make them up" , "Thespians tread these planks" , "Tread them in the theatre" , "Theatre stages" , "Committees or planks" .)