President raves tyrannically about farce (8)
I believe the answer is:
travesty
'farce' is the definition.
(I know that farce can be written as travesty)
'president raves tyrannically about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'TRAVESTY' is hidden in the letters of 'president raves tyrannically'.
(Other definitions for travesty that I've seen before include "Burlesque, parody" , "Grossly unfair representation" , "Charade" , "Burlesque, mockery" , "Grotesque representation" .)