Show some rare vitality (5)
I believe the answer is:
evita
'show' is the definition.
(I've seen this before)
'some rare vitality' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EVITA' can be found hidden inside 'rare vitality'.
(Other definitions for evita that I've seen before include "Musical based on Argentine leader" , "Juan Peron's wife" , "Nineteen Dn musical" , "Andrew Lloyd Webber musical set in Argentina" , "Eva Peron" .)