Tortured genius had broken down (9)
I believe the answer is:
anguished
'tortured' is the definition.
(I know that tortured can be written as anguished)
'genius had broken down' is the wordplay.
'broken down' is an anagram indicator.
'genius'+'had'='geniushad'
'geniushad' anagrammed gives 'ANGUISHED'.
(Other definitions for anguished that I've seen before include "Distressed mentally" , "Dolorous" , "Suffering greatly" .)