Crossword Genius

Sue is of use (7)

Ross

I believe the answer is:

anagram

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

This clue could be a double definition.

'sue' is the first definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.

'of use' is the second definition.
The definition suggests a singular noun which matches the answer.

'is' is the link.

Can you help me to learn more?

(Other definitions for anagram that I've seen before include "Jumbling of letters" , "Word play" , "Mix-up" , ""Diagnose" is one of "San Diego"" , "Word formed by rearranging another word" .)

I've seen this clue in The Globe and Mail.
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