Some propose arresting revolutionary fabulist (5)
I believe the answer is:
aesop
'fabulist' is the definition.
(Greek composer of fables)
'some propose arresting revolutionary' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'revolutionary' says the letters should be written backwards (letters revolve around).
'posea' is hidden within 'propose arresting'.
'posea' backwards is 'AESOP'.
(Other definitions for aesop that I've seen before include "A classical fable teller" , "A pose of famed fable teller" , "Fabulous man" , "Author of many fables" , "story teller" .)