Bombast from silly rich Tories is to be ignored (8)
I believe the answer is:
rhetoric
'bombast' is the definition.
(both can mean dramatic sounding speech)
'silly rich tories is to be ignored' is the wordplay.
'silly' indicates an anagram.
'to be ignored' indicates named letters should be taken away.
'rich'+'tories'='richtories'
'richtories' with 'is' taken away is 'rchtorie'.
'rchtorie' with letters rearranged gives 'RHETORIC'.
'from' acts as a link.
(Other definitions for rhetoric that I've seen before include "Torchier kind of colourful language" , "Art of persuasive use of words" , "Impressive language in public speaking" , "High-flown language as for speeches" , "Reich rot? (anag)" .)