Cleaner to make cover for single piece of furniture (5)
I believe the answer is:
chair
'piece of furniture' is the definition.
(chair is a kind of piece of furniture)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for chair that I've seen before include "Preside, guide meeting" , "president" , "Backed seat for one" , "Supporter" , "rocker?" .)