Outing; stumble (4)
I believe the answer is:
trip
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">outing</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">stumble</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that stumble can be written as trip)</span><br/ ><br/ ></span>
(Other definitions for trip that I've seen before include "Accidental misstep" , "Set off for" , "Journey for some purpose" , "A short journey - stumble on it" , "Outing; stumble" .)