Mournful European member with current account (7)
I believe the answer is:
elegiac
'mournful' is the definition.
(synonym)
'european member with current account' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'member' becomes 'leg' (member can mean a limb).
'with' means one lot of letters go next to another.
'current' becomes 'I' (symbol for electric current).
'account' becomes 'ac' (abbreviation for account).
'e'+'leg'+'i'+'ac'='ELEGIAC'
(Other definitions for elegiac that I've seen before include "Wistful, mournful" , "Expressing poetic sorrow for something past" , "Like classical couplets" , "Wistfully mournful" , "Mournful, lamenting" .)