The most common and most likely answer to this crossword clue is the 11 letter word THEATRELAND
I've seen this crossword clue in The Guardian
T
H
E
A
T
R
E
L
A
N
D
Buddy explains!

The straight part
We know that "the West End" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the west end = theatreland.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 THEATRELAND mean?
THEATRELAND noun- Part of the West End district of London, England, where many theatres can be found.