Ruined cities fail to provide amenities (10)
I believe the answer is:
facilities
'amenities' is the definition.
(I've seen this before)
'ruined cities fail' is the wordplay.
'ruined' indicates an anagram.
'cities'+'fail'='citiesfail'
'citiesfail' with letters rearranged gives 'FACILITIES'.
'to provide' acts as a link.
(Other definitions for facilities that I've seen before include "Services" , "amenities" .)