Very, very thin (5)
I believe the answer is:
sheer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very very thin</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 sheer that I've seen before include "Absolutely - fine - straight up" , "Simple" , "Clear" , "Precipitous or fine" , "total" .)