Coming down a level between flights (7)
I believe the answer is:
landing
This clue is a triple definition!
'coming down' is the first definition.
(I've seen this before)
'a level' is the second definition.
(landing is a kind of level)
'between flights' is the third definition.
(I've seen this before)
(Other definitions for landing that I've seen before include "Going ashore at the top of the stairs" , "somewhere between flights" , "getting in fish" , "Level area between stair flights" , "Upstairs passage" .)