Labor Day mo (4)

I think it could be either:

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sept

(Other definitions for sept that I've seen before include "Thirty days" , "Irish family group" , "Month (abbreviation); clan subdivision (in Ireland)" , "Division of a tribe in Ireland or Scotland" , "Branch of Irish clan" .)

I've seen this clue in the Wall Street Journal, the King Feature Syndicate, the Newsday.com, The Washington Post, the LA Times and the L.A. Times Daily.

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