Fluff, down (4)
I believe the answer is:
fuzz
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">fluff</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">down</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for fuzz that I've seen before include "Indistinctness" , "Frizzy hair; blurred image" , "Police - fluff" , "Adolescent beard - the police" , "Met, perhaps" .)