“Staid” is close (6)

I believe the answer is:

stuffy

I believe this is a double definition.

'staid' is the first definition.
(thesaurus)

'is close' is the second definition.
(both can mean uncomfortably warm)

(Other definitions for stuffy that I've seen before include "Badly ventilated" , "Old-fashioned" , "Airless - humourless" , "Close, airless" , "Close - conventional and dull" .)

I've seen this clue in the Evening Standard.

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