Crossword Genius

Beaming ruler keeping strong, mostly (9)

Ross

I believe the answer is:

refulgent

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'beaming' is the definition.
(I know that beaming can be written as refulgent)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for refulgent that I've seen is " beaming".)

I've seen this clue in The Independent.
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