A party in German's capital can be embarrassing (8)
I believe the answer is:
abashing
'be embarrassing' is the definition.
(I've seen this before)
'a party in german's capital' is the wordplay.
'party' becomes 'bash' (bash is a kind of party**).
'capital' says to take the initial letters.
The first letter of 'germans' is 'g'.
'a'+'bash'+'in'+'g'='ABASHING'
'can' acts as a link.
(Other definitions for abashing that I've seen before include "humiliating" , "embarrassing" , "disconcerting" , "Causing to feel self-conscious" .)