Look like Groucho (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">look like groucho</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 leer that I've seen before include "Stare suggestively" , "Suggestive or sneering look" , "Suggestive or sneering grin" , "Ogle, smirk" , "Look lasciviously at" .)