Tedious lack of variety (8)
I believe the answer is:
monotony
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tedious lack of variety</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 monotony that I've seen before include "fixed routine" , "Lack of excitement" , "Tediousness" , "It's wearisome" , "Sameness" .)