A Quaker may display it (6)

I believe the answer is:

tremor

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'a quaker' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for tremor that I've seen before include "Minor earthquake" , "Involuntary quiver" , "Minor quake" , "Small quake" , "make one shake" .)

I've seen this clue in The Globe and Mail.

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