Walter's let out of the financial centre (4,6)
I believe the answer is:
wall street
'the financial centre' is the definition.
(I've seen this before)
'walter's let out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'walters'+'let'='walterslet'
'walterslet' anagrammed gives 'WALL STREET'.
'of' is the link.
(Other definitions for wall street that I've seen before include "Finance hub" , "Location of US stock exchange" , "US financial centre" , "US financial area" , "Film" .)