It's beyond the directors to be honest (5,5)
I believe the answer is:
above board
'honest' is the definition.
(I've seen this before)
'it's beyond the directors' is the wordplay.
'it's beyond' becomes 'above'.
'the directors' becomes 'board' (I've seen this before).
'above'+'board'='ABOVE-BOARD'
'to be' acts as a link.
(Other definitions for above board that I've seen before include "Fairly and squarely" , "without being underhand" , "Surfer's position should be this" , "MD is" , "Honest - fair" .)