Set free from restraint (7)
(Other definitions for release that I've seen before include "Prisoner eagerly awaits this" , "Let go" , "Free from confinement" , "put out" , "New film" .)
(Other definitions for unleash that I've seen before include "Let off the lead" , "Flee from restraint, allow to pursue like dog" , "Let go" , "Set free from restraint, say a dog" , "Shun ale to free from restraint" .)