Serene, unruffled (6)

I believe the answer is:

placid

This clue is a double definition.

'serene' is the first definition.
(synonyms)

'unruffled' is the second definition.
(synonyms)

(Other definitions for placid that I've seen before include "Calm, unruffled" , "Cool and unruffled" , "Calm, peaceful" , "Calm and not easily upset" , "Quiet and still" .)

I've seen this clue in The Guardian.

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