The most common and most likely answer to this crossword clue is the 9 letter word SHIRRALEE
I've seen this crossword clue in The Guardian
S
H
I
R
R
A
L
E
E
Buddy explains!
The straight part
We know that "In Australia, a load" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in australia, a load = shirralee.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.