Coming down at the top of the stairs? (7)
I believe the answer is:
landing
I believe this clue is a double definition.
'coming down' is the first definition.
(I've seen this before)
'the top of the stairs?' is the second definition.
(area at the top of a flight of stairs)
'at' is the link.
(Other definitions for landing that I've seen before include "Reaching the shore" , "Level space near staircase" , "Going ashore at the top of the stairs" , "Top of a staircase" , "Level area between stair flights" .)