Bank deputy's target (6)
I believe the answer is:
depend
'bank' is the definition.
(I've seen this before)
'deputy's target' is the wordplay.
'deputy' becomes 'dep'.
'target' becomes 'end' (I've seen this before).
'dep'+'end'='DEPEND'
(Other definitions for depend that I've seen before include "Trust confidently, rely on" , "Bank" , "Dangle - rely" , "Rely (upon)" , "Rest" .)