Cupid's counterpart in a famous circus (4)

I believe the answer is:

eros

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'cupid's counterpart' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for eros that I've seen before include "Greek god of love - see statue in Piccadilly" , "London landmark" , "Pagan god" , "One worshipped" , "Arrow-shooting god" .)

I've seen this clue in the Evening Standard.

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