The most common and most likely answer to this crossword clue is the 11 letter word SUSCEPTIBLE
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "Predisposed to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case predisposed to = susceptible.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 SUSCEPTIBLE mean?
SUSCEPTIBLE noun- A person who is vulnerable to being infected by a certain disease
- Likely to be affected by something
- Easily influenced or tricked; credulous
- Especially sensitive, especially to a stimulus
- That, when subjected to a specific operation, will yield a specific result
- Vulnerable; (temporarily) defenseless