Promotional leaflet (5)
I believe the answer is:
flyer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">promotional leaflet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for flyer that I've seen before include "Widely distributed leaflet" , "An aviator or fast mover" , "Pilot" , "Promotional leaflet" , "Aeronaut, aviator" .)