Brooded, putting blame on tyrant (6)
I believe the answer is:
satrap
'tyrant' is the definition.
(historical term for a Persian leader)
'brooded putting blame' is the wordplay.
I cannot really see how this works, but
'brooded' could be 'sat' (to brood eggs is to sit on them) and 'sat' is found within the answer.
'blame' could be 'rap' (synonyms) and 'rap' is present in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'on' is the link.
Can you help me to learn more?
(Other definitions for satrap that I've seen before include "Old Persian governor took a seat to start" , "Persian provincial governor" , "Old head" , "Sparta (anag.)" , "despotic ruler" .)