Foul in the extreme, hunk cavorting with aunt showing no appreciation (10)

I believe the answer is:

unthankful

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'foul in the extreme hunk cavorting with aunt showing no appreciation' is the definition.
I can't tell whether this definition defines the answer.

'foul in the extreme hunk cavorting with aunt' is the wordplay.
'in the extreme' says to hollow out the word (remove centre letters) (the letters on the extremes of the word are used).
'cavorting with' indicates an anagram.
'foul' with its centre taken out is 'fl'.
'fl'+'hunk'='flhunk'
'flhunk' anagrammed with 'aunt' makes 'UNTHANKFUL'.

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I've seen this clue in The Guardian.

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