Holy oil (6)
I believe the answer is:
chrism
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">holy oil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chrism that I've seen before include "Oil consecrated for religious rites" , "Holy oil" .)