Finished with dismissal of English academic (3)
I believe the answer is:
don
'academic' is the definition.
(I've seen this before)
'finished with dismissal of english' is the wordplay.
'finished' becomes 'done' ('done' can be similar in meaning to 'finished').
'with dismissal of' is a deletion indicator.
'english' becomes 'e' (abbreviation).
'done' with 'e' taken out is 'DON'.
(Other definitions for don that I've seen before include "- - Giovanni, 26" , "A mafia chief or Spanish lord" , "Mafia chief or Spanish title" , "Put on; college teacher" , "European river" .)