Japanese straw mat (6)
I believe the answer is:
tatami
'japanese straw mat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tatami that I've seen before include "Japanese rush and straw matting" , "Jap. floor mat" , "Japanese straw mat; a mat, it (anag.)" , "Floor-covering" , "Jap. room matting" .)