Sacristy (6)
I believe the answer is:
vestry
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sacristy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vestry that I've seen before include "Somewhere in church" , "Church sacristy" , "Parochial meeting-room in church" , "Storage and dressing room in a church" , "Small room attached to church" .)