Reduction in price (8)
I believe the answer is:
markdown
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reduction in price</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for markdown that I've seen before include "Lower prices for 21" , "Reduction in price" , "Reduce in price" .)