Blackjack player's opponent
I believe the answer is:
dealer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blackjack player's opponent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dealer that I've seen before include "Buyer and seller of goods" , "One gives out the cards" , "One who trades, perhaps on stock exchange" , "putting his cards on the table?" , "Trader as on Stock Exchange" .)