Branching diagram (4)
I believe the answer is:
tree
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">branching diagram</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 tree that I've seen before include "cross" , "Hazel for instance" , "Tall, woody plant" , "box, possibly" , "Christmas decoration" .)