Piece of furniture one removed from Bulgarian capital (4)
I believe the answer is:
sofa
'piece of furniture' is the definition.
(sofa is a type of furniture)
'one removed from bulgarian capital' is the wordplay.
'one' becomes 'i' (Roman numeral).
'removed from' is a deletion indicator.
'bulgarian capital' becomes 'Sofia' (capital of Bulgaria).
'sofia' with 'i' taken out is 'SOFA'.
(Other definitions for sofa that I've seen before include "Upholstered seating" , "Oafs (anag.)" , "Long upholstered seat with back and arms" , "Area for sitting" , "Wide padded seat" .)