Aussie native everyone accepted readily at first in court (8)
I believe the answer is:
wallaroo
'aussie native' is the definition.
(I know that wallaroo are native to Australia)
'everyone accepted readily at first in court' is the wordplay.
'everyone' becomes 'all' (all people).
'at first' says to take the initial letters.
'in' indicates putting letters inside.
'court' becomes 'woo' (both can mean to romance someone).
The first letters of 'accepted readily' is 'ar'.
'all'+'ar'='allar'
'allar' placed into 'woo' is 'WALLAROO'.
(Other definitions for wallaroo that I've seen before include "big jumper" , "wild beast" , "Creature" .)