Slip-on shoe (4)
(Other definitions for mule that I've seen before include "Obstinate quadruped" , "Sterile offspring of donkey and horse" , "Illegal drugs courier" , "Hybrid beast" , "Drug courier; animal" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slip-on shoe</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 loafer that I've seen before include "maybe put foot in it" , "Casual footwear" , "One habitually putting feet up" , "Comfortable shoe or a do-nothing" , "One shirking work" .)
(Other definitions for moccasin that I've seen before include "Put one's foot in it" , "Slipper; snake" , "Venomous American snake" , "Soft leather 11" , "Soft, slip-on shoe - snake" .)