Stopped a revolutionary taking in the others (8)
I believe the answer is:
arrested
'stopped' is the definition.
(arrest can mean to stop or obstruct)
'a revolutionary taking in the others' is the wordplay.
'revolutionary' becomes 'red' (informal term for communist).
'taking in' means one lot of letters goes inside another.
'the others' becomes 'rest' (eg the rest of a group).
'red' enclosing 'rest' is 'rrested'.
'a'+'rrested'='ARRESTED'
(Other definitions for arrested that I've seen before include "stalled" , "Taken into custody, being serrated" , "Apprehended and taken into custody" , "Stopped - took into custody" , "Seized and took into custody" .)