Crossword Genius

Greek character that's coming after Charlie? (5)

Ross

I believe the answer is:

delta

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

This clue could be a double definition.

'greek character' is the first definition.
(letter from the Greek alphabet)

'coming after charlie?' is the second definition.
The definition suggests a singular noun which matches the answer. I also know that 'charlie' relates to this answer.

'that's' is the link.

Can you help me to learn more?

(Other definitions for delta that I've seen before include "Estuary area where river has split" , "Type of wing" , "Code word for D" , "See Greek" , "Mouth of, eg, the Nile" .)

I've seen this clue in The Telegraph.
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