Run Cambridgeshire city bank (4)
I believe the answer is:
rely
'bank' is the definition.
(thesaurus)
'run cambridgeshire city' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'cambridgeshire city' becomes 'ely' (I've seen this before).
'r'+'ely'='RELY'
(Other definitions for rely that I've seen before include "Depend or lean on" , "Be dependent" , "Depend (upon)" , "Be sure" , "Run and see" .)