What you used to be? (4)

I believe the answer is:

thou

'what you used to be?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for thou that I've seen before include "Second person in the Bible" , "once paired with art" , "Measure" , "Archaic pronoun" , "You (obs.)" .)

I've seen this clue in the L.A. Times Daily, the Universal, the King Feature Syndicate, the Wall Street Journal, The Washington Post and the New York Times.

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