Aussie possibly opposed to work, backing head of faculty (10)
I believe the answer is:
antipodean
'aussie possibly' is the definition.
(I know that Aussie is a type of Antipodean)
'opposed to work backing head of faculty' is the wordplay.
'opposed to' becomes 'anti' (anti means opposing something).
'work' becomes 'op' (abbreviation for opus).
'backing' is a reversal indicator.
'head of faculty' becomes 'dean' (academic position).
'op' back-to-front is 'po'.
'anti'+'po'+'dean'='ANTIPODEAN'
(Other definitions for antipodean that I've seen before include "coming from Perth" , "extreme point" , "Exactly opposite" , "Brit's description of Aussie" , "From Australia and New Zealand" .)