Revolutionary occupants of illicit tavern's high chamber ... (5)
I believe the answer is:
attic
'high chamber' is the definition.
'attic' can be an answer for 'chamber' (I have seen 'Top chamber' mean 'attic' so perhaps 'chamber' could also mean 'attic'). I also know that 'high' relates to this answer.
'revolutionary occupants of illicit tavern's' is the wordplay.
'ATTIC' is hidden back-to-front within the letters.
However, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for attic that I've seen before include "Top storey" , "Top chamber" , "Ancient Greek; loft" , "Greek - upper room" , "Room at the top of a house" .)