The most common and most likely answer to this crossword clue is the 9 letter word WEDNESDAY
I've seen this crossword clue in The Times
W
E
D
N
E
S
D
A
Y
More clues leading to the result WEDNESDAY
- One in seven needs to change driver, avoiding water flowing in road
- 24 hours for you and I to send back first delivery? Yes!
- Midweek mash of swede and last of parsley
- Midweek match time sees Ding become ‘born leader of snooker’
- Woeful mid-week issue
- Married? Yes and sad by middle of the week, perhaps
Buddy explains!
The straight part
We know that "One in seven" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one in seven = wednesday.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.