Sweet air circulated when least energetic (8)

I believe the answer is:

weariest

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'least energetic' is the definition.
I can't judge whether this definition defines the answer.

'sweet air circulated' is the wordplay.
'circulated' indicates anagramming the letters.
'sweet'+'air'='sweetair'
'sweetair' anagrammed gives 'WEARIEST'.

'when' acts as a link.

Can you help me to learn more?

(Other definitions for weariest that I've seen before include "most wanting to lie down?" , "Most exhausted" , "most drained" , "Sweatier, being most tired" , "Most fatigued" .)

I've seen this clue in The Daily Express.

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