Princess sends old queen up in style (4)

I believe the answer is:

diva

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'princess' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for diva that I've seen before include "Famous female singer" , "Grand female singer" , "Successful lady" , "One who sings" , "Operatic ego" .)

I've seen this clue in The Guardian.

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