Rock bottom (5)

I think it could be either:

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3,5 5*

'rock bottom' is the definition.
(a nadir is something's lowest point)

This is all the clue.

(Other definitions for nadir that I've seen before include "Point of greatest despair" , "deep despair" , "Low spot" , "All-time low" , "Rock bottom" .)

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

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