Fix a piece of furniture (6)
I believe the answer is:
settle
I believe this clue is a triple definition!
'fix' is the first definition.
(fix a problem, settle the matter)
'a piece' is the second definition.
(I have seen 'piece of furniture' mean 'settle' so perhaps 'piece' could also mean 'settle')
'of' is a link.
'furniture' is the third definition.
(I know that settle is a type of bench)
(Other definitions for settle that I've seen before include "Become calm and quiet" , "Reach an agreement or become calm" , "Come to an arrangement with the bench?" , "Establish, compose" , "Take up residence" .)