A celebrant dancing in a place of worship (10)
I believe the answer is:
tabernacle
'a place of worship' is the definition.
(tabernacle is a kind of place of worship)
'a celebrant dancing in' is the wordplay.
'dancing' is an anagram indicator.
'in' indicates putting letters inside.
'celebrant' anagrammed gives 'tbernacle'.
'a' going within 'tbernacle' is 'TABERNACLE'.
(Other definitions for tabernacle that I've seen before include "Mormon temple" , "A celebrant (anag) - place of worship" , "Nonconformist church" , "niche in church" , "Tent for the Ark of the Covenant" .)