Lion feasting after playing with boks (4,2,6)

I believe the answer is:

king of beasts

'lion' is the definition.
('king of beasts' can be a synonym of 'lion')

'feasting after playing with boks' is the wordplay.
'after playing with' indicates an anagram.
'feasting' anagrammed with 'boks' makes 'KING OF BEASTS'.

I've seen this clue in The Telegraph.

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