Open-air meal (6)
I believe the answer is:
picnic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">open-air meal</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 picnic that I've seen before include "something easy to do" , "Meal eaten outside" , "Meal outdoors" , "outdoor eating" , "Informal outdoor summer meal" .)