"Lady” who sang "Poker Face” (4)

I believe the answer is:

gaga

(Other definitions for gaga that I've seen before include "Queen's radio recording" , "Somewhat demented" , "Slightly mad (colloq.)" , "Lady < > in a senile" , "Slangily and repetitively crazy" .)

I've seen this clue in the King Feature Syndicate.

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