Earth, good and spherical (6)
I believe the answer is:
ground
'earth' is the definition.
(synonyms)
'good and spherical' is the wordplay.
'good' becomes 'g' (abbreviation).
'and' is a charade indicator (letters next to each other).
'spherical' becomes 'round' (similar in meaning).
'g'+'round'='GROUND'
(Other definitions for ground that I've seen before include "Earth; stadium" , "Pulverised; earth" , "Solid part of the earth's surface" , "what coffee might be" , "Base; reason" .)