Nameless in Japan once (4)

I believe the answer is:

anon

'nameless' is the definition.
(anonymous)

'in japan once' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ANON' can be found hidden inside 'japan once'.

(Other definitions for anon that I've seen before include "Incognito (abbrev)" , "coming after a call" , "soon to be written" , "Some time soon" , "Well-published writer" .)

I've seen this clue in The Mirror.

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