Smarty-pants (6,5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smarty-pants</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 wiseacre that I've seen before include "Know-all" , "One claims to know all" , "Smart Aleck" , "One assuming air of superior wisdom - simpleton" , "Person who tries to appear clever" .)
(Other definitions for clever clogs that I've seen before include "Wise guy" , "Know-all" , "Smartypants" , "Smarties" , "Smart alec" .)