The most common and most likely answer to this crossword clue is the 8 letter word ABLUTION
I've seen this crossword clue in Financial Times
A
B
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T
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Buddy explains!

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 ABLUTION mean?
ABLUTION noun- The act of washing something.
- The liquid used in the cleansing or ablution.
- The ritual consumption by the deacon or priest of leftover sacred wine of host after the Communion.
- The location or building where the showers and basins are located.