Card game for four; a forerunner of bridge (5)
I believe the answer is:
whist
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">card game for four</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">a forerunner of bridge</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for whist that I've seen before include "calls for silence?" , "Card-game" , "18th-century card game, the forerunner of bridge" , "Old card game" , "Trick-taking card game" .)