Part of the time residents upset recluse (7)
I believe the answer is:
eremite
'recluse' is the definition.
(thesaurus)
'part of the time residents upset' is the wordplay.
'part of' indicates a hidden word.
'upset' shows that the letters should be reversed in order.
'etimere' is hidden within 'the time residents'.
'etimere' back-to-front is 'EREMITE'.
(Other definitions for eremite that I've seen before include "Christian hermit or recluse" , "Solitary" , "Christian living in severe circumstances" , "desert father" , "Religious type" .)