Revolutionary army with course of action, making assault (6)
I believe the answer is:
attack
'assault' is the definition.
('attack' can be a synonym of 'assault')
'revolutionary army with course of action' is the wordplay.
'revolutionary' is a reversal indicator.
'army' becomes 'ta' (abbreviation for Territorial Army).
'with' says to put letters next to each other.
'course of action' becomes 'tack' (I've seen this before).
'ta' back-to-front is 'at'.
'at'+'tack'='ATTACK'
'making' is the link.
(Other definitions for attack that I've seen before include "An assault or onslaught" , "Strike" , "Ambush - mug - criticise - fit" , "Show aggression" , "Fiercely criticise" .)