Last tuna cooked for wicked king of Sipylus (8)

I believe the answer is:

tantalus

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

'wicked king of sipylus' is the definition.
I can't tell whether this defines the answer.

'last tuna cooked' is the wordplay.
'cooked' indicates anagramming the letters.
'last'+'tuna'='lasttuna'
'lasttuna' anagrammed gives 'TANTALUS'.

'for' is the link.

Can you help me to learn more?

(Other definitions for tantalus that I've seen before include "Son of Zeus and case for decanters" , "Lydian king" , "Frustrated Greek" , "Secure liquor decanter" , "Lockable case for decanters" .)

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

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