Crossword Genius

Parenthetical trio (4,4)

Ross

I believe the answer is:

area code

(Other definitions for area code that I've seen before include "Regional dialling no." , "Some phone numbers" , "Telephone prefix assigned to a region" , "Location-specific numbers" , "Dialling sequence for, eg, a town" .)

I've seen this clue in the Newsday.
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