Like one article from Japan, say (5)
I believe the answer is:
asian
'from japan say' is the definition.
(I've seen this in another clue)
'like one article' is the wordplay.
'like' becomes 'as'.
'one' becomes 'i' (Roman numeral).
'article' becomes 'an' (indefinite article).
'as'+'i'+'an'='ASIAN'
(Other definitions for asian that I've seen before include "eg Thai" , "Easterner" , "For example, Tamil" , "from way outside the UK" , "Relating to one continent" .)