Construction toy
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">construction toy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(toy bricks)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lego that I've seen before include "Toy building bricks" , "Toy construction set" , "Child's plastic construction set" , "Toy building blocks" , "Building bricks for children" .)