Averse to humourless university official from Down Under (10)
I believe the answer is:
antipodean
'from down under' is the definition.
(I've seen this before)
'averse to humourless university official' is the wordplay.
'averse to' becomes 'anti' (I've seen this in another clue).
'humourless' becomes 'po' (I've seen this in other clues).
'university official' becomes 'dean' (I've seen this in another clue).
'anti'+'po'+'dean'='ANTIPODEAN'
(Other definitions for antipodean that I've seen before include "Brit's description of Aussie" , "Exactly opposite" , "From Australia and New Zealand" , "from NZ?" , "extreme point" .)