Expert group (5-4)
I believe the answer is:
think-tank
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">expert group</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for think-tank that I've seen before include "It researches and reports on policy issues" , "Specialist group investigating specific problem" , "Group of specialists considering problem(s)" , "Group set up to consider various problems" , "Group of experts considering specific problems" .)