Wild card (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wild card</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 joker that I've seen before include "Jester" , "53rd card in the pack?" , "Playing card" , "trickster" , "Card - wag" .)
(Other definitions for riot that I've seen before include "scream" , "Affray, fighting in the streets" , "Wild disturbance by crowd of people" , "Run amok" , "Violent crowd disturbance" .)