Sigmatism, by another name (4)
I believe the answer is:
lisp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sigmatism by another name</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 lisp that I've seen before include "peech impediment" , "Be unable to pronounce S" , "Have difficulty pronouncing `s'" , "speak imperfectly" , "Non-standard pronunciation" .)