The most common and most likely answer to this crossword clue is the 8 letter word HALLOWED
I've seen this crossword clue in The Guardian
H
A
L
L
O
W
E
D
More clues leading to the result HALLOWED
- Sacred chamber, outstanding
- Respected hospital given permission
- Sacred building, outstanding
- Sacred hearts not breaking any laws
- Sacred chamber not yet paid for
- Holy Church finally approved
- Blessed with a word of greeting one day in the middle of the week
- Venerated husband given the thumbs-up
- Blessed husband’s given consent (8
- Public building due to be consecrated
Buddy explains!

The straight part
We know that "Sacred" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sacred = hallowed.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 HALLOWED mean?
HALLOWED verb- To make holy, to sanctify.
- To shout, especially to urge on dogs for hunting.
- Consecrated or sanctified; sacred, holy.