Story, level (5)
I believe the answer is:
floor
I believe this clue is a double definition.
'story' is the first definition.
(I know that story can be written as floor)
'level' is the second definition.
(I know that floor is a type of level)
(Other definitions for floor that I've seen before include "Knock down with force" , "Defeat" , "at bottom of forest" , "Puzzle" , "Knock down - planking" .)