Prima donna has new sofa (5)
I believe the answer is:
divan
'sofa' is the definition.
(divan is a kind of sofa)
'prima donna has new' is the wordplay.
'prima donna' becomes 'diva' ('diva' can be a synonym of 'prima donna').
'has' says to put letters next to each other.
'new' becomes 'n'.
'diva'+'n'='DIVAN'
(Other definitions for divan that I've seen before include "Backless seat; bed" , "Sofa - bed" , "resting place" , "Long backless sofa" , "Viand (anag.)" .)