Religious type with bad nerves? (6)

I believe the answer is:

shaker

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

I don't understand how the rest of the clue works.

(Other definitions for shaker that I've seen before include "Religious American" , "Religious type" , "Container to make a cocktail" , "Member of American Christian sect" , "One gets agitated" .)

I've seen this clue in The Sun.

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