Crossword Genius

A Greek last seen in Sparta? (5)

Ross

I believe the answer is:

alpha

'a greek' is the definition.
(Greek equivalent to 'A')

I don't understand the rest of the clue.

(Other definitions for alpha that I've seen before include "First in order of importance (for a Greek?)" , "As heard on radio, a" , "leader in Athens, originally" , "star of utmost brilliance" , "letter opener" .)

I've seen this clue in The Times.
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