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A
right-beginning,
dotted-letter-including
alphabet
(6)
A right-beginning, dotted-letter-including alphabet (6)
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The definition is at the end of the clue.
How the clue works
Start with A, then R (the beginning of "right"), then place I (the dotted letter) inside ABC (the alphabet) to get ABIC. Stringing it all together gives A + R + ABIC = ARABIC. The clever hyphenation hides the container indicator "including".