Crossword Genius

Bolt's run through these fans (4)

Ross

I believe the answer is:

nuts

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'these fans' is the definition.
(both can mean enthusiasts)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nuts that I've seen before include "Eccentric; coal lumps" , "Beans" , "Hard shells with edible kernels" , "Eg, filberts, hazels" , "Potty" .)

I've seen this clue in The Telegraph.
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