The most common and most likely answer to this crossword clue is the 6 letter word HOOPOE
H
O
O
P
O
E
Buddy explains!
The straight part
We know that "bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bird = hoopoe.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 HOOPOE mean?
HOOPOE noun- An Old World bird, Upupa epops, known for its distinctive plumage, fanlike crest, and slender bill.