Character I confine to college as reprimand (9)
I believe the answer is:
castigate
'reprimand' is the definition.
(I know that castigate is a more specific form of reprimand)
'character i confine to college' is the wordplay.
'character' becomes 'cast' (I've seen this before).
'confine to college' becomes 'gate' (I've seen this before).
'cast'+'i'+'gate'='CASTIGATE'
'as' acts as a link.
(Other definitions for castigate that I've seen before include "Berate" , "Severely criticise" , "Severely reprimand" , "Chastise - tacit sage (anag)" , "Censure severely" .)