The most common and most likely answer to this crossword clue is the 7 letter word GOSLING
I've seen this crossword clue in The Daily Telegraph
G
O
S
L
I
N
G
More clues leading to the result GOSLING
- Start with support for member, developing flier
- Try to get rid of small bird
- Attempt by shy little bird
- Small bird shot with primitive weapon
- Actor who’s started to honk a bit?
- . Try to cast youngster with webbed feet
- Try and throw little bird
- Leave support for little bird
- Leave supporter for one expected to rise to great heights
- Try, with primitive weapon, to get bird
Buddy explains!

The straight part
We know that "Young bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case young bird = gosling.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 GOSLING mean?
GOSLING noun- A young goose.
- A callow), or foolish and naive, young person.
- A catkin on nut trees and pines.