Clerical robe (8)
I believe the answer is:
vestment
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">clerical robe</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vestment that I've seen before include "Robe worn by clergy" , "formal wear" , "Church robe" , "Priestly garment" , "Religious garment" .)