Crossword Genius

He’s randomly concerned with lucky numbers (5)

Ross

I believe the answer is:

ernie

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'he's' is the definition.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ernie that I've seen before include "Els, for example" , "Bondman" , "Wise for instance" , "Boy" , "Selector of winning premium bond numbers" .)

I've seen this clue in the Evening Standard.
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