Wander around noisily in European capital (4)
I believe the answer is:
rome
'european capital' is the definition.
(capital of Italy)
'wander around noisily' is the wordplay.
'wander around' becomes 'roam' (I've seen this in another clue).
'noisily' shows a homophone (sound like).
'roam' sounds like 'ROME'.
'in' is the link.
(Other definitions for rome that I've seen before include "Italian capital (where one Ac died)" , "European capital" , "When here, do as the citizens do" , "Capital city" , "Italian city" .)