The most common and most likely answer to this crossword clue is the 9 letter word ANTIDOTES
I've seen this crossword clue in The Daily Telegraph
A
N
T
I
D
O
T
E
S
Buddy explains!

The straight part
We know that "potions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case potions = antidotes.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 ANTIDOTES mean?
ANTIDOTES noun- A remedy to counteract the effects of poison (often followed by "against," "for," or "to").
- Something that counteracts or prevents something harmful.