Moon’s four states, all in the east (8)
I believe the answer is:
ganymede
'moon's four' is the definition.
The definition suggests a singular noun which matches the answer.
'states all in the east' is the wordplay.
I cannot quite understand how this works, but
'all' could be 'any' (similar in meaning) and 'any' is present in the answer.
'east' could be 'e' (synonyms) and 'e' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ganymede that I've seen before include "servant of God" , "beautiful boy" , "Cupbearer of Greek gods - largest moon of Jupiter" , "Deny game, oddly, of the cupbearer to the gods" , "Cupbearer; satellite of Jupiter" .)