Bank (on) (4)
I believe the answer is:
rely
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bank on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rely that I've seen before include "Be dependent" , "Depend or lean on" , "Lyre (anag.)" , "City with cathedral" , "Have confidence or faith in" .)