The most common and most likely answer to this crossword clue is the 8 letter word SATURDAY
I've seen this crossword clue in The Times
S
A
T
U
R
D
A
Y
More clues leading to the result SATURDAY
- Unhappy about routine picked up over a year, or a lot less
- A Democrat with dull routine written up in Express 24hrs ago?
- Ada, rusty, exercising for twenty-four period
- Study leads to academics rebutting arguments separately within 24-hour period
- Most of tongue covered in Malaysian food for twenty-four hours
- Study Arabic, half drunk, for 24 hours
- Well-built pair of adults admitted separately for 1 at the 28?
- State restricting a motion for the Sabbath
- When I appear astride a stool perhaps
- Time for 29/18
Buddy explains!

The straight part
We know that "24hrs ago" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 24hrs ago = saturday.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.