Show some Conservatives on the rise (5)
I believe the answer is:
evita
'show' is the definition.
(musical by Andrew Lloyd Webber)
'some conservatives on the rise' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'on the rise' says the letters should be written in reverse (in a down clue, letters go up).
'ative' can be found hidden inside 'conservatives'.
'ative' back-to-front is 'EVITA'.
(Other definitions for evita that I've seen before include "Eva Peron" , "Peron musical" , "Juan Peron's wife" , "Musical based on Argentine leader" , "1996 musical film, starring Madonna" .)