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 a hidden word (some parts of the word are used).
'NINJA' can be found hidden inside '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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