Printing mistake (7)
I believe the answer is:
erratum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">printing mistake</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 erratum that I've seen before include "Mistake by Latin scholar" , "gaffe" , "Mistake (in publishing)" , "mistake in text" , "A mistake in printed matter" .)