Some 'daddy', nasty sort of ruler (6)

I believe the answer is:

dynast

'sort of ruler' is the definition.

'some daddy nasty' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'DYNAST' is hidden within 'daddy nasty'.

(Other definitions for dynast that I've seen before include "Member of a hereditary ruling family" , "One ruling" , "Powerful hereditary ruler" .)

I've seen this clue in The Telegraph.

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