Crossword Genius

Important info for a connection, in brief (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "When you'd expect to see" , "when you can hope to receive it" , "Foreign letter" , "When's end of journey predicted" , "Basque separatist movement" .)

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