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