Hired killer from Daisen, in Japan (5)

I believe the answer is:

ninja

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'hired killer' is the definition.
'ninja' can be an answer for 'killer' (I've seen this before). I'm unsure of the 'hired' bit.

'from daisen in japan' is the wordplay.
'from' says the answer is hidden in the clue.
'NINJA' is hidden in the letters of 'daisen in japan'.

Can you help me to learn more?

(Other definitions for ninja that I've seen before include "Expert in espionage" , "Ninjutsu expert" , "Assassins" , "Teenage Mutant -- Turtles (TV/film)" , "Practioner of ninjitsu" .)

I've seen this clue in The Telegraph.

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