Teacher wearing a perm, awfully sorry? (6,2)
I believe the answer is:
pardon me
'sorry?' is the definition.
(I've seen this in another clue)
'teacher wearing a perm awfully' is the wordplay.
'teacher' becomes 'don' (don is a kind of teacher).
'wearing' is an insertion indicator.
'awfully' indicates anagramming the letters.
'a'+'perm'='aperm'
'aperm' with letters rearranged gives 'parme'.
'don' going within 'parme' is 'PARDON ME'.
(Other definitions for pardon me that I've seen before include "Sorry" , "Say that again!" , "Polite apology" .)