Arty gets revised plan of action (8)
I believe the answer is:
strategy
'plan of action' is the definition.
(strategy is a kind of plan of action)
'arty gets revised' is the wordplay.
'revised' indicates an anagram.
'arty'+'gets'='artygets'
'artygets' with letters rearranged gives 'STRATEGY'.
(Other definitions for strategy that I've seen before include "Plan of action, tactics" , "Grand design" , "Approach" , "Systematic plan of action" , "manoeuvres" .)