The most common and most likely answer to this crossword clue is the 9 letter word REFRESHER
I've seen this crossword clue in The Times
R
E
F
R
E
S
H
E
R
More clues leading to the result REFRESHER
- Legal fee is concerning new student
- New student joins part of army course
- Updating course in divinity given to new undergraduate
- Tonic, of course?
- Student chasing alternatives to free drink
- Drink in training review
- Whistleblower at home with female of course
- Sort of course in Religious Education given to new student
- Second course, perhaps, that will revive you
- Such a course concerning new student? Yes and no
Buddy explains!

The straight part
We know that "course" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case course = refresher.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 REFRESHER mean?
REFRESHER noun- Something that refreshes.
- A review to refresh or renew knowledge.
- A fee paid to counsel to continue with a case, especially one that was adjourned.