Smart or Smiley (5)
I believe the answer is:
agent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smart or smiley</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 agent that I've seen before include "Middleman" , "One representing others" , "envoy" , "Dealer" , "Representative - means" .)