Mass converted clan go to in Rome (14)

I believe the answer is:

conglomeration

'mass' is the definition.
(thesaurus)

'converted clan go to in rome' is the wordplay.
'converted' is an anagram indicator.
'clan'+'go'+'to'+'in'+'rome'='clangotoinrome'
'clangotoinrome' anagrammed gives 'CONGLOMERATION'.

(Other definitions for conglomeration that I've seen before include "Gathering" , "Collection or jumble of things" , "pile" , "Large group of merged companies" .)

I've seen this clue in The Times.

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