Crossword Genius

Times (long and short) come up with a letter (5)

Ross

I believe the answer is:

omega

'letter' is the definition.
(omega is a kind of letter of the alphabet)

I can't explain the rest of the clue.

(Other definitions for omega that I've seen before include "Greek long 'o'" , "end of series" , "Greek character symbolizing resistance" , "in Greece, the limit!" , "long letter" .)

I've seen this clue in The Guardian.
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