So Ken prepares something to eat (5)

I believe the answer is:

snoek

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'something to eat' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'so ken prepares' is the wordplay.
'prepares' indicates an anagram (I've seen 'preparing' mean this (the same letters prepared differently)).
'so'+'ken'='soken'
'soken' is an anagram of 'SNOEK'.

Can you help me to learn more?

(Another definition for snoek that I've seen is " South American marine fish".)

I've seen this clue in the Evening Standard.

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