The most common and most likely answer to this crossword clue is the 9 letter word DOORSTEPS
I've seen this crossword clue in The Daily Telegraph
D
O
O
R
S
T
E
P
S
Buddy explains!
The straight part
We know that "Thresholds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thresholds = doorsteps.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 DOORSTEPS mean?
DOORSTEPS noun- An outside step leading up to the door of a building, usually a home.
- One's immediate neighbourhood or locality.
- A big slice, especially of bread.