God in love with singular goddess (6)
I believe the answer is:
osiris
'god' is the definition.
(Osiris is an example)
'love with singular goddess' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'with' is a charade indicator (letters next to each other).
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'goddess' becomes 'iris' (goddess of the rainbow).
'o'+'s'+'iris'='OSIRIS'
'in' is the link.
(Other definitions for osiris that I've seen before include "Egyptian god - sis or I (anag)" , "one held to be divine" , "Egyptian god of the underworld" , "Egypt. god of dead" , "God, husband of Isis" .)