Revolutionary communist pursuing plan to change course (7)
I believe the answer is:
meander
'change course' is the definition.
'revolutionary communist pursuing plan' is the wordplay.
'revolutionary' shows that the letters should be reversed in order.
'communist' becomes 'red' (red is a kind of communist).
'pursuing' means one lot of letters go next to another.
'plan' becomes 'mean' (**).
'red' written backwards gives 'der'.
'der' after 'mean' is 'MEANDER'.
'to' is the link.
(Other definitions for meander that I've seen before include "Wander in leisurely way, like stream" , "Aimless course" , "Wander aimless" , "Indirectly move" , "Renamed (anag)" .)