The most common and most likely answer to this crossword clue is the 11 letter word SKYSCRAPERS
S
K
Y
S
C
R
A
P
E
R
S
Buddy explains!
The straight part
We know that "they’re high" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’re high = skyscrapers.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 SKYSCRAPERS mean?
SKYSCRAPERS noun- A very tall building with a large number of floors.
- A small sail atop a mast of a ship; a triangular skysail.
- Anything very tall or high.