The most common and most likely answer to this crossword clue is the 9 letter word BASILICAS
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Buddy explains!
The straight part
We know that "church buildings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case church buildings = basilicas.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 BASILICAS mean?
BASILICAS noun- A Christian church building having a nave with a semicircular apse, side aisles, a narthex and a clerestory.
- A Roman Catholic church or cathedral with basilican status, a honorific status granted by the pope to recognize its historical, architectural, or sacramental importance.
- An apartment provided in the houses of persons of importance, where assemblies were held for dispensing justice; hence, any large hall used for this purpose.