The most common and most likely answer to this crossword clue is the 7 letter word ROLL-UP
I've seen this crossword clue in Financial Times
R
O
L
L
-
U
P
More clues leading to the result ROLL-UP
Buddy explains!
The straight part
We know that "high risk betting system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case high risk betting system = roll-up.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 ROLL-UP mean?
ROLL-UP adjective- Capable of being made into a cylinder shape by rolling.
- Food made by wrapping ingredients in another food, e.g. fajitas.
- A self-made cigarette of tobacco and rolling paper.
- A business technique where multiple small companies in the same market are acquired and merged.
- A collection of software updates distributed as a single package.
- That which is rolled up; a summation; an aggregation; a total.