Imagine, concoct (5,2)
I believe the answer is:
dream up
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">imagine</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">concoct</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for dream up that I've seen before include "Invent (something)" , "Imagine, invent" , "Invent through imagination" , "'Devise or invent (5,2)'" , "Concoct" .)