Like participants in the rite of rumspringa (5)

I believe the answer is:

amish

(Other definitions for amish that I've seen before include "Relating to a strict US Mennonite sect" , "One 24 [IN-SECT]" , "Of US Mennonites" , "Community that settled in America" , "US religious community" .)

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

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