Release old boy from bawdy part of act (5)
I believe the answer is:
scene
'part of act' is the definition.
(a scene is part of an act in a play)
I don't understand how the remainder of the clue works.
(Other definitions for scene that I've seen before include "Division of a play" , "Section of an act" , "Vista or stage setting" , "site" , "Landscape; public display of anger" .)