River to north of Cambs city bank? (4)
I believe the answer is:
rely
'bank?' is the definition.
(thesaurus)
'river to north of cambs city' is the wordplay.
'river' becomes 'r'.
'to north of' means one lot of letters go next to another (in a down clue, some letters go above others).
'cambs city' becomes 'ely' (I've seen this before).
'r'+'ely'='RELY'
(Other definitions for rely that I've seen before include "Trust, depend" , "Depend, bank" , "Run and see" , "Depend or lean on" , "Be sure" .)