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On board, he usually looks a bit horsy (6)

Ross

I believe the answer is:

knight

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This clue might be a double definition.

'on board' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'he usually looks a bit horsy' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

Can you help me to learn more?

(Other definitions for knight that I've seen before include "board member" , "Give title to; chess piece" , "Titled man - chessman" , "... for example, Tippett" , "Chivalrous warrior of olden times" .)

I've seen this clue in the Evening Standard.
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