Girl keeps going in Italian city (6)
I believe the answer is:
verona
'italian city' is the definition.
(I've seen this before)
'girl keeps going' is the wordplay.
'girl' becomes 'vera' ().
'keeps' indicates putting letters inside.
'going' becomes 'on' (both can mean functioning or activated).
'vera' going around 'on' is 'VERONA'.
'in' acts as a link.
(Other definitions for verona that I've seen before include "Where 27 [MERCUTIO] was killed" , "Romeo and Juliet's city" , "Italian city (with two gentlemen)" , "Whence Shakespeare's two gentlemen" , "Home town of Romeo and Juliet" .)