European MP is sent out for vacancy (9)
I believe the answer is:
emptiness
'vacancy' is the definition.
('emptiness' can be a synonym of 'vacancy')
'european mp is sent out' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'out' indicates an anagram (out can mean wrong or inaccurate).
'is'+'sent'='issent'
'issent' is an anagram of 'tiness'.
'e'+'mp'+'tiness'='EMPTINESS'
'for' is the link.
(Other definitions for emptiness that I've seen before include "vacuum" , "Void state" , "Lack of content" , "Lack of substance" , "Vacancy, void" .)