Extremely tricky to yell at dictator (6)
I believe the answer is:
tyrant
'dictator' is the definition.
(I know that tyrant is a type of dictator)
'extremely tricky to yell' is the wordplay.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'to yell' becomes 'rant' (rant can mean to yell or shout).
'tricky' with its centre taken out is 'ty'.
'ty'+'rant'='TYRANT'
'at' is the link.
(Other definitions for tyrant that I've seen before include "Martinet" , "Harsh and absolute ruler" , "Oppressive and cruel ruler" , "Arbitrary ruler" , "big bully" .)