Nothing missing from diva's performance, say, in spa rooms (7)
I believe the answer is:
solaria
'in spa rooms' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'nothing missing from diva's performance' is the wordplay.
'nothing missing' becomes 'sol' (I can't explain this - if you can you should give a lot more credence to this answer).
'from' says to put letters next to each other.
'diva's performance' becomes 'aria' (I've seen this in another clue).
'sol'+'aria'='SOLARIA'
'say' is the link.
Can you help me to learn more?
(Other definitions for solaria that I've seen before include "tanning rooms" , "Places to get bronze" , "tanneries?" .)