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Either created or was cool and calm (8)

Ross

I believe the answer is:

composed

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'calm' is the definition.
(similar in meaning)

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(Other definitions for composed that I've seen before include "What Gershwin did" , "Calm and collected" , "appear unflappable" , "Settled" , "Serenely self-possessed" .)

I've seen this clue in the Evening Standard.
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