Poster (7)
I believe the answer is:
placard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">poster</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that poster can be written as placard)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for placard that I've seen before include "Slogan or message of protest on board" , "Make card, pal, into kind of ad" , "Sign posted in a public place as an advertisement" , "Large portable notice" , "Notice carried for public display" .)