Standard fellow, eh? (6)
I believe the answer is:
pardon
'eh?' is the definition.
(both are used to ask someone to repeat themselves)
'standard fellow' is the wordplay.
'standard' becomes 'par' (standard of play in golf).
'fellow' becomes 'don' (both can mean an academic).
'par'+'don'='PARDON'
(Other definitions for pardon that I've seen before include ""I'm sorry, could you say that again?"" , "Ask this to seek forgiveness" , "Forgive or remit" , "Polite expression of regret, please excuse" , "Excuse or absolve" .)