Still bald, scratching head (7)
I believe the answer is:
airless
'still' is the definition.
(I've seen this before)
'bald scratching head' is the wordplay.
'bald' becomes 'hairless' (similar in meaning).
'scratching head' means to remove the first letter (the word\'s head is removed).
'hairless' with its first letter removed is 'AIRLESS'.
(Other definitions for airless that I've seen before include "Lacking ventilation" , "Unventilated" , "Close" , "Not ventilated" , "Very stuffy" .)