Dell remodel a vaunted revolutionary part (4)
I believe the answer is:
vale
'dell' is the definition.
(I've seen this in another clue)
'remodel a vaunted revolutionary part' is the wordplay.
'part' indicates a hidden word.
'revolutionary' says the letters should be written backwards (letters revolve around).
'elav' is hidden in the letters of 'remodel a vaunted'.
'elav' written backwards gives 'VALE'.
(Other definitions for vale that I've seen before include "Maida -, N. London area; farewell (archaic)" , "Valley" , "Long depression containing a river" , "Cheers" , "Trough between ridges" .)