Serene, tranquil (4)

I think it could be either:

Which length description are you looking for?:

calm

I believe this is a double definition.

'serene' is the first definition.
(synonyms)

'tranquil' is the second definition.
(synonyms)

(Other definitions for calm that I've seen before include "Imperturbable, soothe" , "Still - force 0 on the Beaufort scale" , "Placid and unruffled" , "Peace, tranquillity" , "'After a storm comes a ....'" .)

I've seen this clue in The Times.

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