Crossword Genius

"What ___ you thinking?" (4)

Ross

I believe the answer is:

(Other definitions for were that I've seen before include "Used to be" , "Existed in the past" , "SECOND PART OF 9" , "(We/you) existed" , "'Are, in the past (4)'" .)

I've seen this clue in The New York Times and the USA Today.
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