The most common and most likely answer to this crossword clue is the 1 plus 5 letter word A LEVEL
A
L
E
V
E
L
More clues leading to the result A LEVEL
- Everything peripheral to First Lady needed for test
- A grade from this?
- Cram everything in the night before? On the contrary for this exam
- Qualification shows everything about a girl
- Exam the night before has broken everyone
- Everyone embraces first lady in Number 10?
- Everything covered the day before this exam
- Test All About Eve
- Everyone embraces first female to get academic qualification
- Exam everyone gets hold of the day before!
Buddy explains!

The straight part
We know that "Number 10?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case number 10? = a level.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.