Girl catching on in Italian city (6)
I believe the answer is:
verona
'italian city' is the definition.
(Verona is a city in Italy)
'girl catching on' is the wordplay.
'girl' becomes 'vera' ().
'catching' indicates putting letters inside.
'vera' placed around 'on' is 'VERONA'.
'in' acts as a link.
(Other definitions for verona that I've seen before include "The Two Gentlemen of-(Shakespeare)" , "The Two Gentlemen of ___ (Shakespeare)" , "Italian city (with two gentlemen)" , "scene in Shakespeare" , "City of Romeo and Juliet near Averno" .)