Falls over again with sun god (7)
I believe the answer is:
niagara
'falls' is the definition.
(Niagara Falls)
'over again with sun god' is the wordplay.
'over' says the letters should be written in reverse.
'with' is a charade indicator (letters next to each other).
'sun god' becomes 'ra' (Egyptian god).
'again' reversed gives 'niaga'.
'niaga'+'ra'='NIAGARA'
(Other definitions for niagara that I've seen before include "A lot of falling water" , "It falls in North America" , "N. American waterfall" , "Famous waterfall" , "River forming part of US-Canada border" .)