Mind shower pressure in boudoir (10)

I believe the answer is:

brainpower

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'mind' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'shower pressure in boudoir' is the wordplay.
'shower' becomes 'rain' (synonyms).
'pressure' becomes 'p' (abbreviation).
'in' is an insertion indicator.
'boudoir' becomes 'bower'.
'rain'+'p'='rainp'
'rainp' placed into 'bower' is 'BRAINPOWER'.

Can you help me to learn more?

(Another definition for brainpower that I've seen is " intelligence".)

I've seen this clue in The Guardian.

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