Crossword Genius

Not only highly expert, this board is right! (4)

Ross

I believe the answer is:

star

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

'not only highly expert' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'board is right' is the wordplay.
'board' becomes 'st' (I am not sure about this - if you are sure you should believe this answer much more).
'is right' becomes 'ar' (I've seen this in other clues).
'st'+'ar'='STAR'

'this' is the link.

Can you help me to learn more?

(Other definitions for star that I've seen before include "Sirius, eg" , "Top performer" , "eg The sun" , "Five-pointed celestial body" , "E.g.Sirius" .)

I've seen this clue in the Evening Standard.
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