Church vault (5)
I believe the answer is:
crypt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">church vault</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crypt that I've seen before include "Undeground room" , "Sepulchre" , "Vault beneath a church" , "Underground cell" , "Underground church vault" .)