Director on board (9)
'director on board?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for helmsman that I've seen before include "Boat steerer" , "Director on board" , "Ship's steerer" , "source of direction" , "One steers a boat" .)
This could be a double definition.
'director' is the first definition.
(thesaurus)
'board' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'on' is the link.
Can you help me to learn more?
(Other definitions for steersman that I've seen before include "Guide for sea voyage" , "One at ship's helm" , "Chap at the helm" .)