Regularly encircle French city (4)
I believe the answer is:
nice
'french city' is the definition.
(Nice is a French city)
'regularly encircle' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'encircle' are 'NICE'.
(Other definitions for nice that I've seen before include "Enjoyable" , "Amiably pleasant" , "Fine as in distinction, or pleasant" , "Pleasant - precise" , "Pleasant - exact" .)