Wuhan Government reveals nasty side effect (8)
I believe the answer is:
hangover
'nasty side effect' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'wuhan government reveals' is the wordplay.
'reveals' indicates the answer is hidden within the clue.
'HANGOVER' can be found hidden inside 'wuhan government'.
Can you help me to learn more?
(Other definitions for hangover that I've seen before include "Morning-after problem" , "result of over-indulgence?" , "What one may have the morning after" , "Headache from drink" , "Sick feeling the morning after the night before" .)