Resist US cash (4)
I believe the answer is:
buck
This clue is a double definition.
'resist' is the first definition.
(thesaurus)
'us cash' is the second definition.
(I've seen this before)
(Other definitions for buck that I've seen before include "Male kangaroo" , "Male deer; (pass the) responsibility" , "Go against" , "something passed to dealer" , "some Australians try to make fast" .)