Bell-ringer's relations not converted (6)
I believe the answer is:
sexton
'bell-ringer's' is the definition.
(church caretaker who may ring church bells)
'relations not converted' is the wordplay.
'relations' becomes 'sex' (euphemism for sex).
'converted' is an anagram indicator.
'not' anagrammed gives 'ton'.
'sex'+'ton'='SEXTON'
(Other definitions for sexton that I've seen before include "One looks after church and churchyard" , "Church officer who attends the clergy" , "Churchwarden" , "Sacristan" , "Church official" .)