Crossword Genius

Article on sacred river getting top grade (5)

Ross

I believe the answer is:

alpha

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

'top grade' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for alpha that I've seen before include "Brilliant star" , "best score" , "First-rate" , "high mark" , "- - and Omega" .)

I've seen this clue in The Times.
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