Church meeting briefly reviewed space below ground level (6)
I believe the answer is:
cellar
'space below ground level' is the definition.
(underground space)
'church meeting briefly reviewed' is the wordplay.
I cannot quite understand how this works, but
'church' could be 'ce' (abbreviation for Church of England) and 'ce' is located in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for cellar that I've seen before include "Wine vault" , "Container for salt" , "Storage space below ground" , "Place for wine" , "Storage area for the wine" .)