A revealing of ancient city in publication of wrongdoing (8)
I believe the answer is:
exposure
'a revealing' is the definition.
(I know that exposure is a type of revealing)
'ancient city in publication of wrongdoing' is the wordplay.
'ancient city' becomes 'ur' (ancient Sumerian city state).
'in' indicates putting letters inside.
'publication of wrongdoing' becomes 'expose' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ur' put within 'expose' is 'EXPOSURE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for exposure that I've seen before include "Display (or removal) of protection" , "Disclosure (by camera?)" , "Risk for Antarctic explorer" , "that is brought to light?" , "Lack of shelter" .)