The most common and most likely answer to this crossword clue is the 10 letter word PERIMETERS
P
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Buddy explains!
The straight part
We know that "boundaries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boundaries = perimeters.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 PERIMETERS mean?
PERIMETERS noun- The sum of the distance of all the lengths of the sides of an object.
- The length of such a boundary.
- The outer limits of an area.
- A fortified strip or boundary usually protecting a military position.
- An instrument for determining the extent and shape of the field of vision.