Crossword Genius

A collection of letters (8)

Ross

I believe the answer is:

alphabet

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

'a collection' is the wordplay.
'a' becomes 'alpha' (the Greek letter A).
'collection' becomes 'bet' (I am not sure about this - if you are sure you should believe this answer much more).
'alpha'+'bet'='ALPHABET'

'of' is the link.

Can you help me to learn more?

(Other definitions for alphabet that I've seen before include "A to Z inclusive" , "Pale bath (anag.)" , "Set of characters" , "All the characters together" , "Ordered set of letters" .)

I've seen this clue in The Globe and Mail.
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