Calm tranquillity (8)

I think it could be either:

Which length description are you looking for?:

stillness

This clue is a double definition.

'calm' is the first definition.
(being still is being calm)

'tranquillity' is the second definition.
(thesaurus)

(Other definitions for stillness that I've seen before include "Motionlessness" , "Lack of movement" , "Quiet, calm" , "Tranquil silence, calmness" , "Tells sins in motionless silence" .)

I've seen this clue in the Sydney Morning Herald.

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