Crossword Genius

Nothing missing from diva's performance, say, in spa rooms (7)

Ross

I believe the answer is:

solaria

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'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?" .)

I've seen this clue in The Telegraph.
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