What may produce staggering pudding wine from Germany (10)
I believe the answer is:
aftershock
'what may produce staggering' is the definition.
(an aftershock might make someone stagger)
'pudding wine from germany' is the wordplay.
'pudding' becomes 'afters' (both can mean dessert).
'wine from germany' becomes 'hock' (type of German wine).
'afters'+'hock'='AFTERSHOCK'
(Other definitions for aftershock that I've seen before include "that causes another little wobble" , "What might have cracked open house" , "another shake" , "Further tremor following quake" , "Ground-breaking" .)