Hackneyed expression (6)
I believe the answer is:
cliche
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hackneyed expression</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 cliche that I've seen before include "Hackneyed idea, plot etc" , "Banal phrase" , "Saying grown familiar through repetition" , "Saying repeated too often" , "Trite phrase" .)