Individual comes after vacuous knee-trembler in European capital (5)
I believe the answer is:
krone
'european capital' is the definition.
'krone' can be an answer for 'capital' (I have seen 'Norwegian capital' mean 'krone' so perhaps 'capital' could also mean 'krone'). I'm unsure of the 'european' bit.
'individual comes after vacuous knee-trembler' is the wordplay.
'individual' becomes 'one' (an individual is one person).
'comes after' says to put letters next to each other.
'vacuous knee trembler' becomes 'kr' (I can't explain this - if you can you should believe this answer much more).
'one' after 'kr' is 'KRONE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for krone that I've seen before include "foreign currency" , "Monetary unit of Denmark" , "European currency" , "Danish bread" , "Money" .)