Brainy, brewing beer in basement (10)
I believe the answer is:
cerebellar
'brainy' is the definition.
Although both the answer and definition are adjectives, I can't understand how one could define the other.
'brewing beer in basement' is the wordplay.
'brewing' indicates an anagram.
'in' means one lot of letters goes inside another.
'basement' becomes 'cellar' (basement room).
'beer' with letters rearranged gives 'rebe'.
'rebe' inserted within 'cellar' is 'CEREBELLAR'.
Can you help me to learn more?
(Another definition for cerebellar that I've seen is " Brainy, to some extent".)