Plan announced for man on board (7)
I believe the answer is:
draught
'man on board' is the definition.
(a piece in the game draughts)
'plan announced' is the wordplay.
'plan' becomes 'draft' (drafting is a kind of planning).
'announced' indicates a 'sounds like' (homophone) clue.
'draft' sounds like 'DRAUGHT'.
'for' is the link.
(Other definitions for draught that I've seen before include "Air current - drink" , "air moving" , "One may make you cold" , "Water depth; served from a cask" , "it's felt, when short of cash" .)