Crossword Genius

Church community breaking code is transgressive, ultimately (7)

Ross

I believe the answer is:

diocese

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'church community' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'breaking code is transgressive ultimately' is the wordplay.
'breaking' indicates anagramming the letters.
'ultimately' suggests the final letters.
The final letter of 'transgressive' is 'e'.
'code'+'is'='codeis'
'codeis' with letters rearranged gives 'dioces'.
'dioces'+'e'='DIOCESE'

Can you help me to learn more?

(Other definitions for diocese that I've seen before include "Jurisdiction of a bishop" , "District under a bishop's authority" , "Ecclesiastical see" , "Bishop's region" , "Church district" .)

I've seen this clue in The Telegraph.
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