Closely compacted (5)
I believe the answer is:
dense
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">closely compacted</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 dense that I've seen before include "Closely-spaced" , "Not very bright" , "Close - compact - stupid" , "Needs (anag) -- thick" , "Stupid; compacted" .)