Persona non __ (5)

I think it could be either:

grata

grate

(Other definitions for grate that I've seen before include "Irritate - rasp - fireplace" , "Rasp; fire holder" , "Jar; fireplace" , "Make a harsh rasping sound" , "Great (anag.)" .)

I've seen this clue in The Wall Street Journal, the Universal, The New York Times, the LA Times, the Sydney Morning Herald and the King Feature Syndicate.

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