The most common and most likely answer to this crossword clue is the 5 letter word CRYPT
C
R
Y
P
T
More clues leading to the result CRYPT
- Weep over pint in church cellar
- Loud call by priest emptied underground chapel
- Loudly announce point in cellar
- Keen priest cleared out part of church
- Underground cell like this crossword, mostly
- Underground room to call mine
- Exclamation over platinum in vault
- Parliament vacated after scream in vault
- Weep taking small part in vault
- Shout by one’s coach in vault
Buddy explains!

The straight part
We know that "underground chapel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case underground chapel = crypt.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CRYPT mean?
CRYPT noun- A cave or cavern.
- An underground vault, especially one beneath a church that is used as a burial place.
- A small pit or cavity in the surface of an organ or other structure.