Blind prophet wearies one, equally (8)
I believe the answer is:
tiresias
'blind prophet' is the definition.
(mythical figure)
'wearies one equally' is the wordplay.
'wearies' becomes 'tires' ('tire' can be a synonym of 'weary').
'one' becomes 'I' (Roman numeral).
'equally' becomes 'as' (synonyms).
'tires'+'i'+'as'='TIRESIAS'
(Other definitions for tiresias that I've seen before include "The blind seer of Thebes" , "soothsayer" .)