... an executive committee has to be in tune with policy (6)
I believe the answer is:
aboard
'to be in tune with policy' is the definition.
I can't tell whether this definition defines the answer.
'an executive committee' is the wordplay.
I cannot quite see how this works, but
'an' could be 'a' and 'a' is present in the answer.
'committee' could be 'board' (board is a kind of committee) and 'board' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'has' acts as a link.
Can you help me to learn more?
(Other definitions for aboard that I've seen before include "'On a ship or train, say (6)'" , "on a train, perhaps" , "on boat, perhaps" , "Ready to sail" , "On (a ship, train, etc)" .)