See you appearing regularly in Chicago (4)
I believe the answer is:
ciao
'see you' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'regularly in chicago' is the wordplay.
'regularly in' means one should take alternating letters.
The alternating letters of 'chicago' are 'CIAO'.
'appearing' acts as a link.
Can you help me to learn more?
(Other definitions for ciao that I've seen before include "Italian hello-goodbye" , "Italian salutation" , "European greeting" , "Italian cheerio" , "Hello and goodbye to the Italians" .)