Crossword Genius

Mail hub: Abbr (3)

Ross

I believe the answer is:

gpo

(Other definitions for gpo that I've seen before include "Site of 1916 Rising" , "Headquarters of the leaders of 1916 Rising" , "Central location of 1916 Rising" , "From which the Proclamation was read in 1916" .)

I've seen this clue in the Newsday.
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