Asked by mistress to leave as it turned out? (8)
I believe the answer is:
expelled
'turned out?' is the definition.
('expel' can be a synonym of 'turn out')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for expelled that I've seen before include "Driven out" , "Forced to leave" , "Removed (eg from school)" .)