The most common and most likely answer to this crossword clue is the 9 letter word CHAFFINCH
I've seen this crossword clue in The Times
C
H
A
F
F
I
N
C
H
More clues leading to the result CHAFFINCH
- Kid wants to steal a bird
- Bird to make slow progress on animal feed
- Hit cut by a very loud church singer
- Bits of corn in church for bird
- Bird a short distance behind remnants of grain
- Bird finding husks of corn in church
- Slowly move beyond something worthless in flier
- 25 husks on small island
- Songbird in distance behind rubbish
- Refuse to move slowly, as winger
Buddy explains!

The straight part
We know that "a bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a bird = chaffinch.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 CHAFFINCH mean?
CHAFFINCH noun- A small passerine bird, Fringilla coelebs, of the finch family.