Amount wagered (5)
I believe the answer is:
stake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amount wagered</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 stake that I've seen before include "Wager; post" , "The money risked on a gamble" , "stout support" , "Pale" , "Wooden post; ante" .)