The most common and most likely answer to this crossword clue is the 6 letter word MERLIN
I've seen this crossword clue in The Guardian
M
E
R
L
I
N
More clues leading to the result MERLIN
- People holding hands: one a legendary charmer
- *Blackbird at home to raptor
- Wizard often having a stoop
- Sheep almost swallowing large falcon
- “Magician” Messi evades Ronaldo’s lunges in netting headers
- A wizard of a bird
- Flier a legendary charmer
- Flier for magician
- Magician appears in gossamer lingerie
- Magician takes flight
Buddy explains!

The straight part
We know that "A wizard/a bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a wizard/a bird = merlin.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 MERLIN mean?
MERLIN noun- A small falcon, Falco columbarius, that breeds in northern North America, Europe, and Asia.
- A cytoskeletal protein active in the suppression of tumors.