Jog along: revolutionary? (4)
I believe the answer is:
trot
I believe this clue is a double definition.
'jog along' is the first definition.
(I've seen this in another clue)
'revolutionary?' is the second definition.
(abbreviation of Trotskyite)
(Other definitions for trot that I've seen before include "leftie" , "Go at steady pace" , "Run with short steps" , "Move quite fast" , "Militant socialist (informal)" .)