Card game; boast (4)
I believe the answer is:
brag
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">card game</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(brag is an old card game)</span><br/ ><br/ >'<span class="explanation-format__original">boast</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that boast can be written as brag)</span><br/ ><br/ ></span>
(Other definitions for brag that I've seen before include "Show off, crow" , "Boast, crow" , "Card game, like poker" , "Idle talk" , "Talk boastfully" .)