Some assassin in Japan (5)

I believe the answer is:

ninja

I'm a little stuck... Click here to teach me more about this clue!

'some assassin in japan' is the definition.
I know that 'japan' relates to this answer.

'some assassin in japan' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'NINJA' is hidden in the letters of 'assassin in japan'.

Can you help me to learn more?

(Other definitions for ninja that I've seen before include "Killer" , "old mercenary" , "Japanese trained assassin" , "Eastern agent" , "Expert in espionage" .)

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