The most common and most likely answer to this crossword clue is the 11 letter word RESTORATIVE
I've seen this crossword clue in The Guardian
R
E
S
T
O
R
A
T
I
V
E
More clues leading to the result RESTORATIVE
Buddy explains!

The straight part
We know that "medicine/medicine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case medicine/medicine = restorative.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 RESTORATIVE mean?
RESTORATIVE noun- Something with restoring properties.
- An alcoholic drink, especially with tonic.
- Serving to restore.