Caretaker’s relations not looking back (6)
I believe the answer is:
sexton
'caretaker's' is the definition.
(sexton is a kind of caretaker)
'relations not looking back' is the wordplay.
'relations' becomes 'sex' (euphemism for sex).
'looking back' shows that the letters should be reversed in order.
'not' back-to-front is 'ton'.
'sex'+'ton'='SEXTON'
(Other definitions for sexton that I've seen before include "Church official" , "Person who looks after church and churchyard" , "church assistant" , "Sacristan" , "Church officer who attends the clergy" .)