Composed of similar elements (11)
I believe the answer is:
homogeneous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">composed of similar elements</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 homogeneous that I've seen before include "Of the same kind" , "Composed of similar elements" , "Uniform, similar" .)