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Non-religious sector, popular with outsiders (7)

Ross

I believe the answer is:

secular

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'non-religious' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for secular that I've seen before include "Worldly" , "Not connected with religion" , "Ignoring God" , "Not religious or sacred" , "associated with those who are 21 [LAYMEN]" .)

I've seen this clue in the Sydney Morning Herald.
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