Crossword Genius

Globe cycling the core (5)

Ross

I believe the answer is:

earth

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'globe' is the definition.
(synonyms)

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

Can you help me to learn more?

(Other definitions for earth that I've seen before include "Heart (anag)" , "See 12" , "cost of which is very high" , "Mud" , "Make electrics safe" .)

I've seen this clue in The Hindu.
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