USSR-led Red revolutionary lacking direction (10)
I believe the answer is:
rudderless
'lacking direction' is the definition.
(I've seen this before)
'ussr-led red revolutionary' is the wordplay.
'revolutionary' indicates anagramming the letters.
'ussr'+'led'+'red'='ussrledred'
'ussrledred' with letters rearranged gives 'RUDDERLESS'.
(Other definitions for rudderless that I've seen before include "not yielding power to steer" , "Without steering mechanism" , "Lacking direction" , "Having lost control" , "Unable to provide guidance" .)