Reading out the charming letters? (8)

I believe the answer is:

spelling

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

'charming letters?' is the definition.
'spelling' can be an answer for 'charming' (performing spells). I'm unsure of the 'letters?' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for spelling that I've seen before include "Enchanting" , "component of education" , "Naming the letters" , "word's construction process" , "Magic" .)

I've seen this clue in the Evening Standard.

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