Cryptic crossword clue
The empty equine facility that may be tried out 8

The most common and most likely answer to this crossword clue is the 8 letter word TESTABLE

I've seen this crossword clue in Financial Times
T
E
S
T
A
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Buddy explains!

The straight part
We know that "that may be tried out" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that may be tried out = testable.
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 TESTABLE mean?

TESTABLE adjective
  1. Susceptible to being tested.
  2. With respect to the scientific method, capable of being proven true or false.
  3. Capable of being devised, or given by will.

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