Celebrant wandering around a place of worship (10)
I believe the answer is:
tabernacle
'place of worship' is the definition.
(tabernacle is a kind of place of worship)
'celebrant wandering around a' is the wordplay.
'wandering' is an anagram indicator.
'around' means one lot of letters goes inside another.
'celebrant' is an anagram of 'taberncle'.
'taberncle' enclosing 'a' is 'TABERNACLE'.
(Other definitions for tabernacle that I've seen before include "A celebrant (anag) - place of worship" , "Nonconformist church" , "Tent for the Ark of the Covenant" , "Mormon place of worship" , "Mormon meeting-place" .)