The most common and most likely answer to this crossword clue is the 7 letter word SABBATH
S
A
B
B
A
T
H
More clues leading to the result SABBATH
- Day off? Graduates turn to wash
- Bah! Bats variant for a day
- Sailor in small tub getting time to rest
- Small group of Swedes getting Thursday as day of rest
- Rebellious graduates wash thoroughly one day a week
- Time off creating soap and bubbles, primarily here?
- Day when alumni go up to southern university
- As rising, heading for breakfast and wash, time for rest
- Crewman in small tub getting time off work
- Graduates returning to university for a day of rest
Buddy explains!

The straight part
We know that "a day" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a day = sabbath.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 SABBATH mean?
SABBATH noun- Saturday, observed in Judaism and some Christian denominations as a day of rest and worship.
- Sunday, observed in most of Christianity as a day of rest and worship.
- Friday, observed in Islam as a day of rest and worship.
- A meeting of witches. (Also called a witches' sabbath, sabbat or black sabbath.)
- Among the ancient Jews and Hebrews, the seventh year, when the land was left fallow.