The most common and most likely answer to this crossword clue is the 9 letter word TREATMENT
I've seen this crossword clue in The Times
T
R
E
A
T
M
E
N
T
More clues leading to the result TREATMENT
- Matter resolved with hospital department: medical care
- Care to pay for the writer's entertainment and books
- Translated message to Alice before later books showing adaptation
- Process intended to avoid a course of drugs
- Matter dealt with by hospital department?
- Awkward matter with ear, nose and throat's medical care
- Behaviour management
- Use cashpoint in plane, perhaps, not empty
- What you may get if patient?
- Surprise people over time in therapy
Buddy explains!

The straight part
We know that "course of drugs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case course of drugs = treatment.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 TREATMENT mean?
TREATMENT noun- The process or manner of treating someone or something.
- Medical care for an illness or injury.
- The use of a substance or process to preserve or give particular properties to something.
- A treatise; a formal written description or characterization of a subject.
- A brief, third-person, present-tense summary of a proposed film.
- Entertainment; treat