At the bar, it saves one standing or falling (5)
I believe the answer is:
stool
'at' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe there's a link between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for stool that I've seen before include "Motion" , "Armless seat" , "Simple seat" , "Seat without a back" , "Backless chair" .)