Severus Snape is brewing charm (14)

I believe the answer is:

persuasiveness

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'charm' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'severus snape is brewing' is the wordplay.
'brewing' indicates an anagram.
'severus'+'snape'+'is'='severussnapeis'
'severussnapeis' anagrammed gives 'PERSUASIVENESS'.

Can you help me to learn more?

(Another definition for persuasiveness that I've seen is " Convincing quality".)

I've seen this clue in The Independent.

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