Ritual in church, one almoner organised (10)
I believe the answer is:
ceremonial
'ritual' is the definition.
(thesaurus)
'church one almoner organised' is the wordplay.
'church' becomes 'ce' (abbreviation for Church of England).
'one' becomes 'i' (Roman numeral).
'organised' indicates anagramming the letters.
'i'+'almoner'='ialmoner'
'ialmoner' is an anagram of 'remonial'.
'ce'+'remonial'='CEREMONIAL'
'in' is the link.
(Other definitions for ceremonial that I've seen before include "Ritual procedure" , "Official" , "Purely formal" , "Ritual(istic)" .)