Do better than (7)
(Other definitions for upstage that I've seen before include "(Of actor) away from the audience" , "Pugs eat (anag.)" , "Divert attention from another as actor might in play" , "Take the limelight from" , "moved away from the audience" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do better than</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for outplay that I've seen before include "Act better" , "Defeat (sport)" , "Perform better than" , "Get the better of" , "As sportsperson, overcome" .)