The most common and most likely answer to this crossword clue is the 6 letter word PEEWIT
I've seen this crossword clue in The Guardian
P
E
E
W
I
T
More clues leading to the result PEEWIT
- Mine includes rising little Scottish shore bird
- Dump serving as nest for tiny bird ascending
- Bird going up rubbish heap gets very little to eat
- It follows end of cigarette being dropped in seat – very small hole
- Bird in Mirror to mourn Independent, gutted
- Bird in depression’s little upset
- Bird taking flight, setter and solver record it
- Shed tears over heart of city flyer
- Bird‘s reversing Mini in place of mine?
- Bird little upset being eaten by quarry?
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 = peewit.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 PEEWIT mean?
PEEWIT noun- Any of several birds