What could make one staid? (8)

I believe the answer is:

sedation

I'm a little stuck... Click here to teach me more about this clue!

'what could' is the definition.
I can't judge whether this defines the answer.

'make one staid?' is the wordplay.
'make' is an anagram indicator.
'one'+'staid'='onestaid'
'onestaid' with letters rearranged gives 'SEDATION'.

Can you help me to learn more?

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

I've seen this clue in The Guardian.

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