Smart alecs (4-4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smart alecs</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for know-alls that I've seen before include "People who behave as if they are conversant with everything" , "People who think they have encyclopedic brains" , "Smart alecs" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smart alecs</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean annoyingly clever people)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for wise guys that I've seen is " Smart Alecs?".)