Revolutionary Bishop enthralled by rock (5)
I believe the answer is:
rebel
'revolutionary' is the definition.
(rebel is a kind of revolutionary)
'bishop enthralled by rock' is the wordplay.
'bishop' becomes 'B' (abbreviation used in chess).
'enthralled by' indicates putting letters inside ('enthral' can mean 'capture').
'rock' becomes 'reel' (I've seen this before).
'b' going inside 'reel' is 'REBEL'.
(Other definitions for rebel that I've seen before include "Rise up - dissent" , "Anti-establishment figure" , "Refuse orders" , "Rejector of authority" , "Kick over the traces" .)