One more on Earth that spins (7)
I believe the answer is:
another
'one more' is the definition.
(I've seen this before)
'on earth that spins' is the wordplay.
'that spins' indicates an anagram.
'on'+'earth'='onearth'
'onearth' is an anagram of 'ANOTHER'.
(Other definitions for another that I've seen before include "Additional: alternative" , "Somebody else" , "encore?" , "On earth (anag.)" , "No heart (anag.)" .)