One using money (7)
I believe the answer is:
spender
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one using money</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for spender that I've seen before include "One paying out money" , "poet, communist" , "Waster" , "writer of poetry" , "One who disburses money - big in popular song" .)