The name would be shorter without it being diminutive (5)
I believe the answer is:
evita
'the name' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for evita that I've seen before include "Stage musical" , "1996 musical film, starring Madonna" , "Peron musical" , "Musical based on Argentine leader" , "Show" .)