Mad about (4,2)

I think it could be either:

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4,2

gaga

'mad about' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for gaga that I've seen before include "Barmy joke, third in cracker" , "Foolishly doting" , "Slightly mad (colloq.)" , "Very fond of" , "Lady who sings" .)

I've seen this clue in The New York Times.

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