Evidently nervous sect member? (6)

I believe the answer is:

shaker

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'evidently nervous sect member?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

This is all the clue.

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(Other definitions for shaker that I've seen before include "who plays tambourine?" , "Member of American Christian sect" , "Member of an ascetic Christian sect" , "Member of ecstatic sect" , "Container to make a cocktail" .)

I've seen this clue in The Sun.

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