Sleep stage (3)
I believe the answer is:
rem
'sleep stage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rem that I've seen before include "Sleep stage when dreaming occurs" , "Phase in sleep" , "radiation unit" .)
I've seen this clue in The Wall Street Journal, The New York Times, the USA Today, the LA Times and the King Feature Syndicate.
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