"Ciao" in Chihuahua
I believe the answer is:
adios
'ciao in chihuahua' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for adios that I've seen before include "so long abroad" , "Spanish farewell" , "Good-bye (Sp.)" , "Goodbye (Spanish)" , "Adieu, arrivederci" .)