Current man on board (7)
I believe the answer is:
draught
This clue is a double definition.
'current' is the first definition.
(thesaurus)
'man on board' is the second definition.
(a piece in the game draughts)
(Other definitions for draught that I've seen before include "Swallow" , "Water depth; served from a cask" , "Air current - drink" , "Dragging or pulling - man on board!" , "Unwanted air current" .)