Thinly dispersed (6)
I believe the answer is:
sparse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thinly dispersed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sparse that I've seen before include "Meagre; scarce" , "Thin on the ground, scarce" , "Infrequent" , "One's not at all thick" , "In short supply" .)