Ritual miracle one produces (10)
I believe the answer is:
ceremonial
'ritual' is the definition.
(thesaurus)
'miracle one produces' is the wordplay.
'produces' is an anagram indicator.
'miracle'+'one'='miracleone'
'miracleone' is an anagram of 'CEREMONIAL'.
(Other definitions for ceremonial that I've seen before include "Ritual procedure" , "Ritual(istic)" , "Official" , "Purely formal" .)