Staff that protect rebuilt city? Sure (8)
I believe the answer is:
security
'staff that protect' is the definition.
(security staff or bodyguards)
'rebuilt city? sure' is the wordplay.
'rebuilt' is an anagram indicator.
'city'+'sure'='citysure'
'citysure' with letters rearranged gives 'SECURITY'.
(Other definitions for security that I've seen before include "peace of mind" , "Protection from possibility of future financial difficulty" , "cover" , "State of being free from danger or injury" , "Pledged item; safety" .)