Some Argentine vitality in musical? (5)
I believe the answer is:
evita
'musical?' is the definition.
(I've seen this before)
'some argentine vitality in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'EVITA' can be found hidden inside 'argentine vitality in'.
(Other definitions for evita that I've seen before include "Andrew Lloyd Webber musical set in Argentina" , "1978 Lloyd Webber musical" , "Well-known musical" , "Juan Peron's wife" , "Eva Peron" .)