Arrogant person, refusing to take advice, knocks half of the brick structure (7)
I believe the answer is:
knowall
'arrogant person refusing to take advice' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'knocks half of the brick structure' is the wordplay.
'half of' means to take half the letters.
'the brick structure' becomes 'wall' (wall is a kind of structure. I am not sure about the 'brick' bit.).
'knocks' cut in half is 'kno'.
'kno'+'wall'='KNOWALL'
Can you help me to learn more?
(Other definitions for knowall that I've seen before include "self-appointed expert" , "Clever clogs" , "Cocky type" .)