The most common and most likely answer to this crossword clue is the 8 letter word REEDIEST
I've seen this crossword clue in The Guardian
R
E
E
D
I
E
S
T
Buddy explains!

The straight part
We know that "most likely to bend?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most likely to bend? = reediest.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 REEDIEST mean?
REEDIEST adjective- Full of, or edged with, reeds.
- (of a sound or voice) High and thin in tone.
- (of a person) Tall and thin.
- Imperfectly welded together in masses of rods.