Banishment (8)
(Other definitions for sidle that I've seen before include "Isled (anag.)" , "Walk sideways in furtive manner" , "Walk stealthily" , "Walk obliquely" , "Slink, creep, sneak" .)
'banishment' is the definition.
(exile is a kind of banishment)
This is all the clue.
(Other definitions for exile that I've seen before include "Ostracism" , "Banish from one's country" , "Car journey" , "being always away from home" , "Banish; expel" .)
'banishment' is the definition.
(I know that ostracism is a type of ejection)
This is the entire clue.
(Other definitions for ostracism that I've seen before include "Exclusion from a group or society" , "isolation" , "Boycott" , "Banishment" , "Shunning" .)
(Other definitions for eviction that I've seen before include "Dispossession by law" , "Expulsion (from a property)" , "Lawful dispossession" , "Removal of tenant by law" , "Expulsion from a premises" .)