Stream barred return of predatory beast (7)
I believe the answer is:
outflow
'stream' is the definition.
(thesaurus)
'barred return of predatory beast' is the wordplay.
'barred' becomes 'out' (someone barred has been kicked out of a bar).
'return of' shows that the letters should be reversed in order.
'predatory beast' becomes 'wolf'.
'wolf' reversed gives 'flow'.
'out'+'flow'='OUTFLOW'
(Other definitions for outflow that I've seen before include "Large amount transferred to another place" , "Tofu owl (anag.)" , "Discharge" , "Amount of liquid moving away" , "Amount flooding away" .)