Stuffy description of one with no successor, we hear (7)
I believe the answer is:
airless
'stuffy' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for airless that I've seen before include "not a breath of wind" , "Still" , "Close" , "Not ventilated" , "Stifling" .)