Comfortable about stifling report (7)
I believe the answer is:
gunshot
'report' is the definition.
(I've seen this before)
'comfortable about stifling' is the wordplay.
'comfortable' becomes 'snug' (similar in meaning).
'about' shows that the letters should be reversed in order.
'stifling' becomes 'hot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'snug' backwards is 'guns'.
'guns'+'hot'='GUNSHOT'
Can you help me to learn more?
(Other definitions for gunshot that I've seen before include "Firing of hand weapon" , "Firearm's range -- no thugs (anag)" , "Range of a specific weapon" , "Crack" , "Noughts (anag)" .)