Tranquil, placid (4)

I believe the answer is:

calm

This clue is a double definition.

'tranquil' is the first definition.
(synonyms)

'placid' is the second definition.
(synonyms)

(Other definitions for calm that I've seen before include "'After a storm comes a ....'" , "Still or peaceful" , "Cool and collected" , "Composure or serenity" , "Peace or stillness" .)

I've seen this clue in The Irish Times.

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