Ruler gives extremely tacky and intemperate speech (6)
I believe the answer is:
tyrant
'ruler' is the definition.
(I know that tyrant is a type of dictator)
'extremely tacky and intemperate speech' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'and' is a charade indicator (letters next to each other).
'intemperate speech' becomes 'rant' (I've seen this before).
'tacky' with its centre removed is 'ty'.
'ty'+'rant'='TYRANT'
'gives' acts as a link.
(Other definitions for tyrant that I've seen before include "Person dictating" , "Martinet" , "Oppressive and cruel ruler" , "Harsh and absolute ruler" , "Autocrat or despot" .)