"Poker Face" singer Lady __ (4)

I believe the answer is:

gaga

(Other definitions for gaga that I've seen before include "Queen's radio recording" , "Slang for crazy - apply a gag" , "Foolishly doting" , "Senile or crazy in repetitive way" , "Somewhat demented" .)

I've seen this clue in the LA Times and the Universal.

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