From very bright to b..... wet! (6)

I believe the answer is:

brainy

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'from very bright' is the definition.
I can't tell whether this definition defines the answer.

'b wet' is the wordplay.
'wet' becomes 'rainy' (similar in meaning).
'b'+'rainy'='BRAINY'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for brainy that I've seen before include "smart?" , "Having a high IQ" , "Highly intelligent" , "Binary (anag.)" , "Clever, got lots of grey matter" .)

I've seen this clue in the Evening Standard.

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