Tory introduced to rewrite proclamation (5)
I believe the answer is:
edict
'proclamation' is the definition.
(thesaurus)
'tory introduced to rewrite' is the wordplay.
'tory' becomes 'c'.
'introduced to' indicates putting letters inside.
'rewrite' becomes 'edit' (I've seen this before).
'c' placed within 'edit' is 'EDICT'.
(Other definitions for edict that I've seen before include "Authoritative ruling" , "An official command" , "Decree, order" , "Formal order" , "Injunction" .)