That horsy man leaping about on board! (6)

I believe the answer is:

knight

I'm a little stuck... Click here to teach me more about this clue!

'board' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for knight that I've seen before include "Heroic champion" , "Old freelance" , "rider looking for adventure?" , "eg Elton John" , "... for example, Tippett" .)

I've seen this clue in the Evening Standard.

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