Talk of the Irish, say (4)

I believe the answer is:

erse

(Other definitions for erse that I've seen before include "Kind of Gaelic for seer" , "Possibly the language" , "Old name for Celtic languages" , "Old Scots or Irish Gaelic" , "Name sometimes given to languages of the Celts in Ireland and Scotland" .)

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

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