Prima donna's new bed? (5)
I believe the answer is:
divan
'bed?' is the definition.
(I've seen this before)
'prima donna's new' is the wordplay.
'prima donna' becomes 'diva' ('diva' can be a synonym of 'prima donna').
'new' becomes 'n'.
'diva'+'n'='DIVAN'
(Other definitions for divan that I've seen before include "Sort of bed" , "Long backless sofa" , "resting place" , "Sofa - bed" , "Piece of furniture" .)