Church cabal is worried about Italy (8)
I believe the answer is:
basilica
'church' is the definition.
(I know that basilica is a type of church)
'cabal is worried about italy' is the wordplay.
'worried' is an anagram indicator.
'about' means one lot of letters goes inside another.
'italy' becomes 'i'.
'cabal'+'is'='cabalis'
'cabalis' with letters rearranged gives 'basilca'.
'basilca' enclosing 'i' is 'BASILICA'.
(Other definitions for basilica that I've seen before include "Church or cathedral of high rank" , "Roman public administration building Christian church" , "Large Christian church with two rows of columns and apse at one end" , "Important Roman Catholic church" , "Roman Catholic cathedral with special privileges" .)