Crossword Genius

Oscar's best mate? (2,5,7)

Ross

I believe the answer is:

an ideal husband

'best mate?' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for an ideal husband that I've seen before include "the perfect match?" , "best mate?" , "Dramatic scenes involving perfect groom" , "Play by Oscar Wilde" , "best man?" .)

I've seen this clue in The Guardian.
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