One is able to go round east of this city (4)
I believe the answer is:
caen
'this city' is the definition.
(I have seen 'French city' mean 'caen' so perhaps 'city' could also mean 'caen')
'one is able to go round east' is the wordplay.
'one is able to' becomes 'can' (if you can do something you are able to do it).
'go round' indicates putting letters inside.
'east' becomes 'e' (synonyms).
'can' going around 'e' is 'CAEN'.
'of' is the link.
(Other definitions for caen that I've seen before include "City in Normandy" , "French city" .)