Turned to greeting tragic hero (7)
I believe the answer is:
othello
'tragic hero' is the definition.
(I've seen this before)
'turned to greeting' is the wordplay.
'turned' says the letters should be written in reverse.
'greeting' becomes 'hello' (hello is a kind of greeting).
'to' back-to-front is 'ot'.
'ot'+'hello'='OTHELLO'
(Other definitions for othello that I've seen before include "Desdemona's husband" , "Dramatic Moor" , "Old Black Ram!" , "Shakespeare's general" , "jealous husband" .)