Brainchild (4)
I believe the answer is:
idea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brainchild</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 idea that I've seen before include "Suggestion" , "Thought or notion (4)" , "Thought; concept" , "Plan" , "Purpose" .)