Horsy looking fellow on board (6)
I believe the answer is:
knight
This clue could be a double definition.
'horsy looking fellow' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'board' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'on' is the link.
Can you help me to learn more?
(Other definitions for knight that I've seen before include "cavalier" , "In Britain, a person honoured by the sovereign for personal merit" , "Give title of 'Sir' to" , "Chesspiece - person dubbed" , "Chess piece (in shining armour?)" .)