Tranquil, calm (6)

I believe the answer is:

serene

I believe this clue is a double definition.

'tranquil' is the first definition.
(synonyms)

'calm' is the second definition.
(synonyms)

(Other definitions for serene that I've seen before include "Calm and unruffled, like a princely title." , "Not agitated" , "Tranquil, perfectly calm" , "Calm, untroubled" , "Placid" .)

I've seen this clue in The Times.

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