Mooner star fiddled with is one into heavenly bodies (10)
I believe the answer is:
astronomer
'is one into heavenly bodies' is the definition.
I can't judge whether this defines the answer.
'mooner star fiddled' is the wordplay.
'fiddled' indicates an anagram.
'mooner'+'star'='moonerstar'
'moonerstar' anagrammed gives 'ASTRONOMER'.
'with' is the link.
Can you help me to learn more?
(Other definitions for astronomer that I've seen before include "Sky-at-night observer" , "Moon starer (anag.)" , "scientist" , "Space studier" , "Dorado may be contemplated by me" .)