Magician has affair with Romeo after brief snog (11)

I believe the answer is:

necromancer

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'magician' is the definition.
(I know that necromancer is a type of magician)

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

(Other definitions for necromancer that I've seen before include "Madame Arcati" , "magician" , "Sorcerer" , "Black artist" .)

I've seen this clue in The Independent.

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