Shock to receive refusal about it from caretaker (7)
I believe the answer is:
janitor
'caretaker' is the definition.
(thesaurus)
'shock to receive refusal about it' is the wordplay.
'shock' becomes 'jar' (I've seen this in other clues**).
'to receive' indicates putting letters inside.
'refusal' becomes 'no'.
'about' indicates putting letters inside.
'no' enclosing 'it' is 'nito'.
'jar' placed around 'nito' is 'JANITOR'.
'from' is the link.
(Other definitions for janitor that I've seen before include "(In Scotland) school caretaker" , "Person looking after building" , "Caretaker (mainly US)" , "Caretaker or doorkeeper" , "One employed to clean and maintain a building" .)