The most common and most likely answer to this crossword clue is the 9 letter word BANKNOTES
B
A
N
K
N
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T
E
S
More clues leading to the result BANKNOTES
- Proscribe different tokens for cash
- 1Ac prohibits restricting free token
- They promise to provide money and forbid counterfeit tokens
- More than one bill to prohibit ties with leader of extremists introduced
- Outlaw group with odd bits of easy money
- Money entanglement involved in causes of ruin
- Money which is tied up in poisons
Buddy explains!

The straight part
We know that "They promise to provide money" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they promise to provide money = banknotes.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 BANKNOTES mean?
BANKNOTES noun- A promissory note issued by a bank, payable at a given time to a specific beneficiary.
- A piece of paper currency.