Outer border (4)
(Other definitions for rim that I've seen before include "Edge, border" , "'Brim, lip (3)'" , "Circular outer edge" , "Raised edge of a round object" , "Curved edge" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">outer border</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 edge that I've seen before include "Side, brink" , "Rim - move gradually" , "incisiveness" , "Bind" , "Outer limit" .)