Born in Japan? Some martial artist? (5)

I believe the answer is:

ninja

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'born in japan? some martial artist?' is the definition.
I know that 'japan' relates to this answer.

'born in japan? some' is the wordplay.
'born' becomes 'n'.
'japan?' becomes 'j'.
'some' becomes 'a'.
'n'+'in'+'j'+'a'='NINJA'

Can you help me to learn more?

(Other definitions for ninja that I've seen before include "Fourteenth-century Japanese assassin" , "Japanese spy or assassin" , "agent from the east" , "martial art expert" , "Expert in espionage" .)

I've seen this clue in the Sydney Morning Herald.

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