Toy brick brand (4)
I believe the answer is:
lego
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">toy brick brand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lego that I've seen before include "construction kit" , "Building bricks for children" , "Toy building-bricks" , "Toy with interlocking blocks" , "Toy construction set" .)