Globe cycling the core (5)
I believe the answer is:
earth
'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" .)