After-effects good in German city (8)
I believe the answer is:
hangover
'after-effects' is the definition.
I can't judge whether this definition defines the answer.
'good in german city' is the wordplay.
'good' becomes 'g' (abbreviation).
'in' means one lot of letters goes inside another.
'german city' becomes 'Hanover' (city in Germany).
'g' put into 'hanover' is 'HANGOVER'.
Can you help me to learn more?
(Other definitions for hangover that I've seen before include "result of overdoing it" , "Headache from drink" , ""Morning after" experience" , "morning-after feeling?" , "Sick feeling the morning after the night before" .)