Wuhan Government reveals up nasty side effect (8)

I believe the answer is:

hangover

I'm a little stuck... Click here to teach me more about this clue!

'up nasty side effect' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'wuhan government reveals' is the wordplay.
'reveals' indicates a hidden word.
'HANGOVER' is hidden within 'wuhan government'.

Can you help me to learn more?

(Other definitions for hangover that I've seen before include "a pain come the morning?" , "Morning after sickness?" , "result of wasted time" , "Effect of excess drink" , "Headache from drink" .)

I've seen this clue in the Sydney Morning Herald.

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