Serenely quiet or peaceful (8)

I believe the answer is:

tranquil

(Other definitions for tranquil that I've seen before include "Unruffled" , "Peaceful - calm" , "Serenely quiet or peaceful" , "composed" , "Peaceful and quiet, not agitated" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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