The most common and most likely answer to this crossword clue is the 7 letter word OPTIONS
I've seen this crossword clue in The Daily Telegraph
O
P
T
I
O
N
S
More clues leading to the result OPTIONS
Buddy explains!
The straight part
We know that "possibilities" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case possibilities = options.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 OPTIONS mean?
OPTIONS noun- One of a set of choices that can be made.
- The freedom or right to choose.
- A contract giving the holder the right to buy or sell an asset at a set strike price; can apply to financial market transactions, or to ordinary transactions for tangible assets such as a residence or automobile.
- To purchase an option on something.
- To configure, by setting an option.