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' suggests deleting specific letters.
'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" .)