US ten-cent coin (4)
I believe the answer is:
dime
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">us ten-cent coin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for dime that I've seen before include "US ten cent coin" , "US ten cent piece" , "10 US cents" , "Something round and silvery" , "Ten cents in USA" .)