The others completely in a calm way (9)

I believe the answer is:

restfully

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'in a calm way' is the definition.
I can't judge whether this definition defines the answer.

'the others completely' is the wordplay.
'the others' becomes 'rest' (eg the rest of a group).
'completely' becomes 'fully' (in full).
'rest'+'fully'='RESTFULLY'

Can you help me to learn more?

(Another definition for restfully that I've seen is " in a calm manner".)

I've seen this clue in The Daily Express.

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