Shaking (7)

I think it could be either:

Which length description are you looking for?:

tremor

'shaking' is the definition.
(I know that tremor is a type of shaking)

This is the entire clue.

(Other definitions for tremor that I've seen before include "Involuntary quiver" , "A little agitation" , "Quiver or vibration" , "Vibration - shaking" , "Slight earthquake" .)

I've seen this clue in the Penny Press.

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