Thickness (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thickness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Thickness of yarn ' mean 'ply' so perhaps 'thickness' could also mean 'ply')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ply that I've seen before include "A layer to work at diligently." , "Use or wield, tool or weapon" , "Strand, of wool or wood, say" , "Layer of folded material" , "'Persist in offering, liquor say (3)'" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thickness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for density that I've seen before include "showing obtuseness" , "there's stupidity for you!" , "Bulk" , "Mass per volume" , "can be relative" .)