Vault, like this clue - not in charge (5)
I believe the answer is:
crypt
'vault' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for crypt that I've seen before include "Church basement" , "Underground church vault" , "Undeground room" , "Underground cell" , "Tomb" .)