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 Washington Post, the LA Times, the L.A. Times Daily, the King Feature Syndicate, the Wall Street Journal and the Newsday.com.

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