Bank is right one to oversee diverse working (9)
I believe the answer is:
riverside
'bank' is the definition.
(I know that bank is a type of bank)
'right one to oversee diverse working' is the wordplay.
'right' becomes 'r' (common abbreviation).
'one' becomes 'i' (Roman numeral).
'to oversee' says to put letters next to each other (some letters go over and look down on others).
'working' indicates anagramming the letters.
'diverse' is an anagram of 'verside'.
'r'+'i'+'verside'='RIVERSIDE'
'is' is the link.
(Other definitions for riverside that I've seen before include "Area along, say, the Thames" , "Bank" .)