Crusade (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crusade</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for holy war that I've seen before include "Jihad" , "Religious conflict" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crusade</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that crusade is a more specific form of campaign)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for campaign that I've seen before include "electioneering" , "Electioneer" , "A series of planned activities, as for advertising" , "Organised course of action" , "Plan of action" .)