Salted part of a margarita glass (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">salted part of a margarita glass</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 rim that I've seen before include "Flange" , "Brim, edge" , "Raised edge of a round object" , "An edge, canyon or cup" , "Circular outer edge" .)