Public upset when vase goes missing (5)
I believe the answer is:
overt
'public' is the definition.
(both can mean well-known or unconcealed)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for overt that I've seen before include "Open to view" , "Not concealed - public" , "Done in an obvious way" , "Patent, evident" , "totally visible" .)