American visiting courts in EU country (7)
I believe the answer is:
austria
'eu country' is the definition.
(I've seen this before)
'american visiting courts' is the wordplay.
'american' becomes 'us'.
'visiting' indicates putting letters inside.
'courts' becomes 'atria' (atrium is a kind of court).
'us' placed inside 'atria' is 'AUSTRIA'.
'in' is the link.
(Other definitions for austria that I've seen before include "Us tiara found in a European state" , "German-speaking republic" , "Capital city is Vienna" , "Under the Hapsburgs, it controlled the Holy Roman Empire" , "Its aura is in Europe" .)