Very bright or black and showery (6)

I believe the answer is:

brainy

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'very bright' is the definition.
'brainy' can be an answer for 'bright' (I've seen this before). I am not certain of the 'very' bit.

'black and showery' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'and' means one lot of letters go next to another.
'showery' becomes 'rainy' (synonyms).
'b'+'rainy'='BRAINY'

'or' is the link.

Can you help me to learn more?

(Other definitions for brainy that I've seen before include "Bright" , "Intellectual" , "smart?" , "Binary (anag.)" , "Highly intelligent" .)

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