European leaves America just like that (4)
I believe the answer is:
thus
'like that' is the definition.
(as in 'like so')
'european leaves america' is the wordplay.
'european leaves' becomes 'th' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'america' becomes 'US' (United States).
'th'+'us'='THUS'
'just' is the link.
Can you help me to learn more?
(Other definitions for thus that I've seen before include "Consequently" , "In this manner" , "Shut (anag.)" , "As a result" , "as indicated" .)