Due-in hr (3)

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "When's end of journey predicted" , "Arrival roughly indicated" , "Militants" , "Greek letter E; estimated time of arrival (abbr.)" , "Something like 10 [RHO]" .)

I've seen this clue in The Washington Post Sunday, The Washington Post, the LA Times and the L.A. Times Daily.

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