Amount bet (5)
I believe the answer is:
stake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amount bet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stake that I've seen before include "Post; money wagered" , "Sum gambled" , "Pale" , "Post; gamble" , "Investment" .)