Fall mo. (4)

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3 3* 4*

'fall mo' is the definition.
(I've seen this in another clue)

This is all the clue.

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

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