Straightforward board member has no alternative (6)
I believe the answer is:
direct
'straightforward' is the definition.
(straightforward can mean direct)
'board member has no alternative' is the wordplay.
'board member' becomes 'director' (I've seen this before).
'has no' indicates named letters should be taken away.
'alternative' becomes 'or'.
'director' with 'or' taken out is 'DIRECT'.
(Other definitions for direct that I've seen before include "By the shortest route" , "Immediate - aim" , "Candid" , "Straight; manage" , "Order; straight" .)