Drive of husband engaged by board of directors (6)
I believe the answer is:
thrust
'drive' is the definition.
('thrust' can be a synonym of 'drive')
'husband engaged by board of directors' is the wordplay.
'husband' becomes 'h'.
'engaged by' is an insertion indicator (I've seen this in other clues).
'board of directors' becomes 'trust'.
'h' put within 'trust' is 'THRUST'.
'of' acts as a link.
(Other definitions for thrust that I've seen before include "Push forcefully" , "Push forward as with fencing sword" , "Lunge; propulsive force" , "Sudden lunge (of sword)" , "Push forward with truths" .)