Terribly anti about, as a fellow Australian (9)
I believe the answer is:
tasmanian
'australian' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'terribly anti about as a fellow' is the wordplay.
'terribly' is an anagram indicator.
'about' indicates putting letters inside.
'a fellow' becomes 'man' (fellow can mean a man).
'anti' is an anagram of 'tian'.
'as'+'man'='asman'
'tian' going around 'asman' is 'TASMANIAN'.
Can you help me to learn more?
(Other definitions for tasmanian that I've seen before include "Aussie statesman" , "One from Hobart, say" , "Islander" , "From one Australian state" , "Ferocious Australian marsupial" .)