Cryptic crossword clue
Theatre ultimately invested in opening, not ending 9

The most common and most likely answer to this crossword clue is the 9 letter word UNCEASING

U
N
C
E
A
S
I
N
G

Buddy explains!

The straight part
We know that "not ending" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not ending = unceasing.
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 UNCEASING mean?

UNCEASING adjective
  1. Continuous; continuing indefinitely without stopping

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