Male deer; dollar (4)
I believe the answer is:
buck
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">male deer</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">dollar</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(slang)</span><br/ ><br/ ></span>
(Other definitions for buck that I've seen before include "Blood < money" , "Male antelope" , "Animal - dollar - responsibility" , "(Of a trend) resist" , "some Australians try to make fast" .)