In front of sun god, turn sun back into a planet (6)
I believe the answer is:
uranus
'a planet' is the definition.
(I know that Uranus is a Jovian planet)
'in front of sun god turn sun back' is the wordplay.
'in front of' is a charade indicator (letters next to each other) (some letters go in front of others).
'sun god' becomes 'ra' (Egyptian god).
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'back' is a reversal indicator.
'sun' in reverse letter order is 'nus'.
'ra' put after 'u' is 'ura'.
'ura'+'nus'='URANUS'
'into' acts as a link.
(Other definitions for uranus that I've seen before include "world" , "USA urn on major planet" , "Greek god ruler of universe, or a major planet" , "Seventh rock from the sun?" , "Planet that's the butt of much wordplay" .)