Speak unclearly (4)
I believe the answer is:
slur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">speak unclearly</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 slur that I've seen before include "Pronounce words indistinctly" , "disgrace" , "making indistinct sound" , "Negative comment" , "Insinuation, allegation" .)