Prima donna on new bed (5)
I believe the answer is:
divan
'bed' is the definition.
(I've seen this before)
'prima donna on new' is the wordplay.
'prima donna' becomes 'diva' (synonyms).
'on' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'diva'+'n'='DIVAN'
(Other definitions for divan that I've seen before include "resting place" , "Sort of bed" , "Sofa - bed" , "Sideless, backless couch" , "Backless seat; bed" .)