Letter misdirected in Matabeleland (4)
I believe the answer is:
beta
'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" .)