Crossword Genius

Crazy girl I dumped (3)

Ross

I believe the answer is:

mad

'crazy' is the definition.
(I know that crazy can be written as mad)

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

(Other definitions for mad that I've seen before include "Insane - furious" , "Crazed" , "Aberrant" , "Crazy" , "Deranged" .)

I've seen this clue in The Times.
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