A side not spoiling state of calm (8)

I believe the answer is:

sedation

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'state of calm' is the definition.
'sedation' can be an answer for 'state' (sedation is a kind of state). I'm not sure about the 'of calm' bit.

'a side not spoiling' is the wordplay.
'spoiling' indicates anagramming the letters.
'a'+'side'+'not'='asidenot'
'asidenot' anagrammed gives 'SEDATION'.

Can you help me to learn more?

(Other definitions for sedation that I've seen before include "Effect of calming drug" , "State of drug-induced calm" , "Calming with drugs" , "The administering of sleep-inducing drugs" .)

I've seen this clue in The Daily Express.

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