Subordinate after complete power (8)
I believe the answer is:
dominion
'power' is the definition.
(thesaurus)
'subordinate after complete' is the wordplay.
'subordinate' becomes 'minion' (I've seen this before).
'after' says to put letters next to each other.
'complete' becomes 'do' (doing is a kind of completing).
'minion' after 'do' is 'DOMINION'.
(Other definitions for dominion that I've seen before include "Jurisdiction" , "Authority to rule over and control people" , "Supremacy" , "territory" , "Realm" .)