Outflow of currency (3)
I believe the answer is:
ebb
This might be a double definition.
'outflow' is the first definition.
(I've seen this in another clue)
'currency' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'of' is the 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" .)