I'm leaving — then I'm back for Asian furnishing (6)
I believe the answer is:
tatami
'asian furnishing' is the definition.
(type of Japanese floor covering)
'i'm leaving then i'm back' is the wordplay.
'i'm leaving' becomes 'tata' (you might say ta-ta or goodbye when leaving).
'then' says to put letters next to each other.
'back' says the letters should be written backwards.
'im' reversed gives 'mi'.
'tata'+'mi'='TATAMI'
'for' acts as a link.
(Other definitions for tatami that I've seen before include "Japanese straw mat; a mat, it (anag.)" , "Jap. room matting" , "Japanese rush and straw matting" , "Jap. floor mat" , "Floor-covering" .)