A rag man unscrambled a word puzzle (7)

I believe the answer is:

anagram

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

'puzzle' is the definition.
(an anagram is a word puzzle)

'a rag man unscrambled a word' is the wordplay.
'a rag man' can be anagrammed to 'ANAGRAM'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for anagram that I've seen before include "reordering" , ""Diagnose" is one of "San Diego"" , "Sort of letters" , "Nag a ram (anag)" , "Word arranging the letters of another" .)

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

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