Concoct, as a plan (5)
I believe the answer is:
hatch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concoct as a plan</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 hatch that I've seen before include "Opening with removable door" , "contrive to > emerge in > shade" , "Breed" , "serve here?" , "Draw fine lines" .)