Get on with directors? (5)
I believe the answer is:
board
This clue is a double definition.
'get on' is the first definition.
(eg boarding a train)
'directors?' is the second definition.
(board of directors)
'with' is the link.
(Other definitions for board that I've seen before include "Get on - governing body" , "Decision-making body" , "Go onto (a ship)" , "Plank" , "Directors' group" .)