More spherical (7)
I believe the answer is:
rounder
'more spherical' is the definition.
('round' can be similar in meaning to 'spherical')
This is the entire clue.
(Other definitions for rounder that I've seen before include "More rotund" , "complete circuit in a game" , "More circular" , "Score in bat and ball game" , "Or under (anag.)" .)