I go to rave about note, knowing nothing (8)
I believe the answer is:
ignorant
'knowing nothing' is the definition.
(I've seen this before)
'i go to rave about note' is the wordplay.
'to rave' becomes 'rant' ('rant' can be a synonym of 'rave').
'about' means one lot of letters goes inside another.
'note' becomes 'n' (abbreviation**).
'go'+'rant'='gorant'
'gorant' enclosing 'n' is 'gnorant'.
'i'+'gnorant'='IGNORANT'
(Other definitions for ignorant that I've seen before include "Ill-educated" , "No rating (anag) - clueless" , "Devoid of knowledge" , "Lacking knowledge or skill" , "Unlearned, lacking knowledge" .)