Cycling race at home ground (5)
I believe the answer is:
earth
'ground' 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 "Fox's or badger's lair" , "World - soil" , "Heart of clay" , "Third rock from the Sun" , "Where some creatures live" .)