Crossword Genius

Be excellent with gloss (5)

Ross

I believe the answer is:

shine

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'be' is the definition.
(shining is a kind of being)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shine that I've seen before include "Lustre" , "Give off bright light" , "Beam" , "Glimmer" , "Radiate or excel" .)

I've seen this clue in The Daily Express.
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