Average, ordinary (6)
I believe the answer is:
normal
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">average</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">ordinary</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for normal that I've seen before include "Commonplace" , "Run-of-the-mill" , "Conforming to a standard" , "Standard; at right angles" , "Popular" .)