Winter hours in NYC (3)

I believe the answer is:

est

'winter hours in nyc' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for est that I've seen before include "Time Americans adopted" , "Suffix showing superlative" , "self-improvement programme" , "psychological programme" .)

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

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