Efflux (7)
I believe the answer is:
outflow
'efflux' is the definition.
(I know that efflux can be written as outflow)
This is the entire clue.
(Other definitions for outflow that I've seen before include "running away" , "Amount flooding away" , "Tofu owl (anag.)" , "Discharge" , "Large amount transferred to another place" .)