Japanese runner reflected in Hiroshima tattoo (6)
I believe the answer is:
tatami
'japanese runner' is the definition.
The definition suggests a singular noun which matches the answer.
'reflected in hiroshima tattoo' is the wordplay.
'reflected' says the letters should be written backwards.
'in' indicates the answer is hidden within the clue.
'imatat' can be found hidden inside 'hiroshima tattoo'.
'imatat' reversed gives 'TATAMI'.
Can you help me to learn more?
(Other definitions for tatami that I've seen before include "Japanese rush and straw matting" , "Jap. room matting" , "Japanese straw mat; a mat, it (anag.)" , "Jap. floor mat" , "Floor-covering" .)