Crossword Genius

Letter misdirected in Matabeleland (4)

Ross

I believe the answer is:

beta

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

'letter' is the definition.
(I know that beta is a type of letter)

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

Can you help me to learn more?

(Other definitions for beta that I've seen before include "character in Marathon" , "less than perfect mark" , "sort of test" , "second class grade?" , "Second letter of the Greek alphabet" .)

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