Crossword Genius

Female who’s good at spelling? (5)

Ross

I believe the answer is:

witch

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'female' is the definition.
(witch is a kind of female)

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

Can you help me to learn more?

(Other definitions for witch that I've seen before include "Female sorcerer" , "One of a coven" , "Female member of coven" , "... and magician" , "'The Lion, the - - and the Wardrobe'" .)

I've seen this clue in The Times.
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