Eponymous heroine saves island home for birds (5)
I believe the answer is:
eyrie
'home for birds' is the definition.
'eponymous heroine saves island' is the wordplay.
'eponymous heroine' becomes 'eyre' (Jane Eyre).
'saves' is an insertion indicator.
'island' becomes 'i'.
'eyre' enclosing 'i' is 'EYRIE'.
(Other definitions for eyrie that I've seen before include "Eagle's lair" , "An eagle's nest (5)" , "Bird's nest" , "nest site" , "place for the high and mighty" .)