Tranquil, unruffled (6)

I believe the answer is:

serene

I believe this clue is a double definition.

'tranquil' is the first definition.
(I know that tranquil can be written as serene)

'unruffled' is the second definition.
(I've seen this before)

(Other definitions for serene that I've seen before include "Peaceful and unruffled" , "Calm and unclouded" , "Peaceful and contented" , "Totally unagitated" , "Calm and at peace" .)

I've seen this clue in The Irish Times.

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