Crossword Genius

Reportedly, what Cupid has for lover (4)

Ross

I believe the answer is:

beau

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'for lover' is the definition.
(beau is a kind of lover)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for beau that I've seen before include "An old boy friend like Brummel?" , "An old-fashioned boy friend (4)" , "One loving" , "Sweetheart" , "Handsome young lover" .)

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