Adherents raised quiet offspring lacking depth (5)

I believe the answer is:

sikhs

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'adherents' is the definition.
(I know this)

I don't understand the rest of the clue.

(Other definitions for sikhs that I've seen before include "Followers of an Indian religion" , "Members of a religion who wear turbans" , "Followers of gurus" , "Religious adherents" , "Followers of Guru Nanak" .)

I've seen this clue in The Independent.

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