The most common and most likely answer to this crossword clue is the 6 letter word DRONGO
I've seen this crossword clue in The Guardian
D
R
O
N
G
O
More clues leading to the result DRONGO
- Doctor on leave gets dope from Australia
- Drive forward, light saying you can?
- Flash Gordon, flyer
- Doctor on leave, Aussie twit
- Fool — character from Lear — carrying monarch round
- Gordon could be a moron
- Doctor working with energy is an idiot
- Bird doctor's circular letter on PETA, for example
- Bird's chant cut short, to continue later
Buddy explains!

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 DRONGO mean?
DRONGO noun- Any bird of the family Dicruridae.
- A fool, an idiot, a stupid fellow.