Crossword Genius

Widespread issue of currency (5)

Ross

I believe the answer is:

delta

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This clue could be a double definition.

'widespread issue' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'currency' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for delta that I've seen before include "Estuary area where river has split" , "Spreading river mouth" , "Nile river mouth" , "Silted estuary" , "Divided river outlet" .)

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