Listen and learn, unhappily, about European (4,2,3)
I believe the answer is:
lend an ear
'listen' is the definition.
(I've seen this before)
'learn unhappily about european' is the wordplay.
'unhappily' indicates an anagram.
'about' means one lot of letters goes inside another.
'european' becomes 'dane' (someone from Denmark).
'learn' is an anagram of 'lenar'.
'lenar' going around 'dane' is 'LEND-AN-EAR'.
'and' is the link.
(Other definitions for lend an ear that I've seen before include "Follow Mark Antony" , "Pay attention" , "Listen attentively (to)" , "Listen - to borrower" , "Hark" .)