Cape __, the easternmost point of mainland Australia (5)
I believe the answer is:
byron
(Other definitions for byron that I've seen before include "one who could produce lyrical lines" , "English poet, 1788-1824" , "Lord . . . . ., English poet who wrote 'Childe Harold's Pilgrimage'" , "English poet, said to be 'mad, bad, and dangerous to know', d. 1824" , "Author of 'Don Juan'" .)