Cleric ranking just below a priest in Christian churches (6)
I believe the answer is:
deacon
'cleric ranking just below a priest in christian churches' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for deacon that I've seen before include "Church officer" , "Priest's assistant" , "A member of the lower orders of clergy" , "Church post" , "Clergyman of low rank" .)