Crossword Genius

Blue material (4)

Ross

I believe the answer is:

smut

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blue material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for smut that I've seen before include "(Speck) of dirt" , "Soot, dirt, grit" , "Bit of soot or dirty talk" , "blue material" , "Small flake of dirt" .)

I've seen this clue in The New York Times.
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