City's farewell message - refusal to be upset (5)
I believe the answer is:
ripon
'city's' is the definition.
(I've seen this before)
'farewell message refusal to be upset' is the wordplay.
'farewell message' becomes 'rip' (I can't explain this - if you can you should believe this answer much more).
'refusal' becomes 'no'.
'to be upset' shows that the letters should be reversed in order (I've seen 'being upset' mean this).
'no' back-to-front is 'on'.
'rip'+'on'='RIPON'
Can you help me to learn more?
(Other definitions for ripon that I've seen before include "Town in N. Yorkshire" , "N. Yorks market town" , "northern town" , "North Yorkshire cathedral city" , "Yorks cathedral" .)