Very bright or black and showery (6)
I believe the answer is:
brainy
'very bright' is the definition.
'brainy' can be an answer for 'bright' (both can mean intelligent). I am not certain of the 'very' bit.
'black and showery' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'and' says to put letters next to each other.
'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" .)