The most common and most likely answer to this crossword clue is the 9 letter word AFFLUENCE
I've seen this crossword clue in The Times
A
F
F
L
U
E
N
C
E
More clues leading to the result AFFLUENCE
- A criminal catching disease being loaded
- Complaint that a criminal is concealing wealth
- Rubbish, naff clue last in puzzle for “wealth”
- A virus stops criminal having cash to splash
- Being well off, a criminal suppresses illness
- Wealth is a barrier restricting disease
- Gutless Italian flees power, replaced by a female offering wealth
- Wealth is a common disease in criminal surroundings
- A criminal catching disease — it comes with having money
- Naff clue once shunned by beginners bringing riches?
Buddy explains!

The straight part
We know that "riches" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case riches = affluence.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 AFFLUENCE mean?
AFFLUENCE noun- An abundant flow or supply.
- An abundance of wealth.
- A moderate level of wealth.
- An influx.