Visual pun (5)
I believe the answer is:
rebus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">visual pun</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 rebus that I've seen before include "Ian Rankin's Scottish detective" , "Visual type of word puzzle" , "Word puzzle involving pictures" , "Word puzzle with pictures and letters" , "Puzzle consisting of pictures representing syllables and words" .)