Airborne, flying around noon - easy task

I believe the answer is:

no-brainer

I'm a little stuck... Click here to teach me more about this clue!

(Other definitions for no-brainer that I've seen before include "Something requiring no mental thought" , "Something requiring little thought" , "Trivial problem" , "It's totally clear" , "Something requiring little or no mental effort" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app