Be contingent or rely (6)
I believe the answer is:
depend
This clue is a double definition.
'be contingent' is the first definition.
(I've seen this in another clue)
'rely' is the second definition.
(to depend on someone is to rely on them)
(Other definitions for depend that I've seen before include "Trust confidently, rely on" , "Rely or hang on" , "Put trust (in)" , "Be contingent upon" , "Bank" .)