A Catholic declaration for glory (7)
I believe the answer is:
acclaim
'glory' is the definition.
(thesaurus)
'a catholic declaration' is the wordplay.
'catholic' becomes 'c' (abbreviation as in RC for Roman Catholic).
'declaration' becomes 'claim' (claim is a kind of declaration).
'a'+'c'+'claim'='ACCLAIM'
'for' is the link.
(Other definitions for acclaim that I've seen before include "commendation" , "Credit" , "Salute, applaud" , "Plaudits" , "Extol" .)