Dictator typically ends on harangue (6)
I believe the answer is:
tyrant
'dictator' is the definition.
(I have seen 'Cruel dictator ' mean 'tyrant' so perhaps 'dictator' could also mean 'tyrant')
'typically ends on harangue' is the wordplay.
'ends' suggests removing the centre.
'on' says to put letters next to each other.
'harangue' becomes 'rant' ('rant' can be a synonym of 'harangue').
'typically' with its middle removed is 'ty'.
'ty'+'rant'='TYRANT'
(Other definitions for tyrant that I've seen before include "Person dictating" , "Despot, dictator" , "Autocrat - bully" , "Harsh and absolute ruler" , "Arbitrary ruler" .)