Being suitably seated can make a person calm (6)

I believe the answer is:

sedate

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

'calm' is the definition.
(I know that calm can be written as sedate)

'being suitably seated can make a person' is the wordplay.
'seated' can be anagrammed to 'SEDATE'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sedate that I've seen before include "Placid" , "Calm and dignified in manner" , "Unexciting" , "Give calming drug to" , "Dignified and subdued" .)

I've seen this clue in the Evening Standard.

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