Underground burial place (8)
I believe the answer is:
catacomb
'underground burial place' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for catacomb that I've seen before include "Underground alcoved tunnel for burying the dead" , "It's a grave situation" , "series of tunnels" , "Professional kneader" , "Underground Roman burial place" .)