Cupid's counterpart (4)
I believe the answer is:
eros
'cupid's counterpart' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eros that I've seen before include "Sore about love god" , "Orbiter" , "Statue of love-god in Piccadilly Circus in London" , "Roman god of love, Cupid" , "God of love - example of 1 down" .)