An item replaced for the resident (6)
I believe the answer is:
inmate
'the resident' is the definition.
(inmate is a kind of resident)
'an item replaced' is the wordplay.
'replaced' indicates an anagram.
'an'+'item'='anitem'
'anitem' is an anagram of 'INMATE'.
'for' is the link.
(Other definitions for inmate that I've seen before include "One institutionally confined" , "you mightn't want him to escape" , "One living in institution" , "eg Prisoner" , "Person confined to institution" .)