Average teacher sorry? (6)
I believe the answer is:
pardon
'sorry?' is the definition.
(I've seen this before)
'average teacher' is the wordplay.
'average' becomes 'par' (average score in golf).
'teacher' becomes 'don' (don is a kind of teacher).
'par'+'don'='PARDON'
(Other definitions for pardon that I've seen before include "Forgiveness - I beg yours" , "What was that you said" , "Polite expression of regret, please excuse" , "Let off" , "Excuse me, kindly overlook" .)