Compressed (5)
I believe the answer is:
dense
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">compressed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dense that I've seen before include "Solid, thick" , "Slow-witted" , "Closely crowded together" , "Tightly packed - stupid" , "Close-knit" .)