Crossword Genius

Might one be servant from taverns? (7)

Ross

I believe the answer is:

anagram

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

'servant from taverns?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'might one be' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
'be' could be 'am' and 'am' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for anagram that I've seen before include "Word rearranged from the letters of another" , ""Supersonic"of "percussion", for example?" , "Rearrangement of letters in word or phrase to form another" , ""Schoolmaster" is of "the classroom", for example" , "5 down is one" .)

I've seen this clue in The Sun.
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