MP has date arranged in part of London (9)
I believe the answer is:
hampstead
'part of london' is the definition.
(I've seen this before)
'mp has date arranged' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'mp'+'has'+'date'='mphasdate'
'mphasdate' anagrammed gives 'HAMPSTEAD'.
'in' is the link.
(Other definitions for hampstead that I've seen before include "part of London" , "London district" .)