Pugilist Fury is stony with rage (5)

I believe the answer is:

tyson

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

'pugilist' is the definition.
(I know that Tyson is a professional boxer)

'fury is stony with rage' is the wordplay.
'stony' anagrams to 'TYSON'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tyson that I've seen before include "26 4 [RING MASTER]" , "American world heavyweight champion, b. 1966" , "US world heavyweight boxing champion, b.1966 -- English fast bowler, d. 2015" , "Undisputed world heavyweight champion, 1987" , "Mike --, US boxer" .)

I've seen this clue in The Guardian.

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