Cleric to chance road detour (10)
I believe the answer is:
'cleric' is the definition.
(I've seen this before)
'chance road detour' is the wordplay.
'detour' is an anagram indicator.
'chanceroad' is an anagram of 'ARCHDEACON'.
'to' is the link.
(Other definitions for archdeacon that I've seen before include "Anglican clergyman" , "Church official" , "Church dignitary" , "Senior Christian cleric" , "Member of clergy" .)