Spanish city to farewell new US spy agency (8)
I believe the answer is:
valencia
'spanish city' is the definition.
(I've seen this before)
'farewell new us spy agency' is the wordplay.
'farewell' becomes 'vale' ('farewell' in Latin).
'new us spy' becomes 'n' (I am not sure about this - if you are sure you should believe this answer much more).
'agency' becomes 'CIA' (CIA is an example).
'vale'+'n'+'cia'='VALENCIA'
'to' is the link.
Can you help me to learn more?
(Other definitions for valencia that I've seen before include "Spanish city and region" , "Region and major port of eastern Spain" , "European city" , "European area" , "city in Spain?" .)