Sicilian city (7)
'sicilian city' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for palermo that I've seen before include "Main city of Sicily" , "Italian city" , "Italian capital" , "Chief city of Sicily" , "ity of Italy" .)
(Other definitions for messina that I've seen before include "Sicilian port" , "City in Sicily" .)