Act of going out (6)

I believe the answer is:

exodus

(Other definitions for exodus that I've seen before include "A mass departure, as in 2nd book of Old Testament" , "a mass departure as in Bible Book" , "A great departure as in the Bible" , "Book following Genesis" , "Second book of the Old Testament" .)

I've seen this clue in The Telegraph and the Irish Times (Simplex).

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