Crossword Genius

Outflow of currency (3)

Ross

I believe the answer is:

ebb

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This clue could be a double definition.

'outflow' is the first definition.
(I have seen 'Tidal outflow ' mean 'ebb' so perhaps 'outflow' could also mean 'ebb')

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

'of' acts as a link.

Can you help me to learn more?

(Other definitions for ebb that I've seen before include "Outward flow of the tide" , "Not to wax" , "Type of tide" , "Go out or recede like tide" , "(Water) recede" .)

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