Insult, slangily
I believe the answer is:
diss
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">insult slangily</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 diss that I've seen before include "Eastern town" , "Algerian grass" , "East Anglian town" , "Norfolk town" , "Be impolite" .)