The most common and most likely answer to this crossword clue is the 5 letter word BUDGE
I've seen this crossword clue in The Daily Telegraph
B
U
D
G
E
More clues leading to the result BUDGE
- Revise opinion? Swell to have change of heart!
- Yield from funds reduced
- Cutting back on plan for Treasury move
- Shift gear initially, entering seaside resort
- Move that’s a bit of a bloomer, say, on reflection
- Move most of allocated funds
- Cagebird‘s not half needed to shift
- Move one away from pet in cage
- Move resulting from golf in Cornish resort
Buddy explains!

The straight part
We know that "Cagebird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cagebird = budge.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 BUDGE mean?
BUDGE verb- To move.
- To move.
- To yield in one’s opinions or beliefs.
- (Minnesota, Wisconsin, Iowa) To cut or butt (in line); to join the front or middle rather than the back of a queue.
- To try to improve the spot of a decision on a sports field.
- Brisk; stirring; jocund.
- A kind of fur prepared from lambskin dressed with the wool on, formerly used as an edging and ornament, especially on scholastic habits.
- Austere or stiff, like scholastics