Glass accommodating a church’s style (7)
I believe the answer is:
panache
'style' is the definition.
(synonyms)
'glass accommodating a church's' is the wordplay.
'glass' becomes 'pane' (I've seen this before).
'accommodating' indicates putting letters inside.
'church' becomes 'ch' (common abbreviation).
'a'+'ch'='ach'
'pane' going around 'ach' is 'PANACHE'.
(Other definitions for panache that I've seen before include "A confident stylish manner" , "Distinctive elegance" , "flourish" , "Flamboyant confidence" , "A dashing manner" .)