Plane taking off and touching down? (5)
I believe the answer is:
level
'plane' is the definition.
(I know that plane can be written as level)
I don't understand how the rest of the clue works.
(Other definitions for level that I've seen before include "Palindromic storey" , "Not in front or behind" , "Staying at same height" , "Straight, even" , "Experience an evening out" .)