The most common and most likely answer to this crossword clue is the 4 letter word ARVO
I've seen this crossword clue in Independent
A
R
V
O
More clues leading to the result ARVO
- Of popular vote, over a third for Australian PM
- Aussie PM visiting Qatar voluntarily
- Bravo removes helmet, gets hurt in the afternoon, down under
- Carton’s inside around five wanting a bit of tea – that’s Sydney’s afternoon!
- Maybe Victorian PM comes from Caernarvonshire
- Rule adopted by a very old Aussie PM
Buddy explains!

The straight part
We know that "Australian PM (afternoon, not prime minister!)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case australian pm (afternoon, not prime minister!) = arvo.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.
What does ARVO mean?
ARVO noun- Afternoon.