Cryptic crossword clue
They hope to gain from their betters 10

The most common and most likely answer to this crossword clue is the 10 letter word BOOKMAKERS

I've seen this crossword clue in The Guardian
B
O
O
K
M
A
K
E
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S

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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 BOOKMAKERS mean?

BOOKMAKERS noun
  1. A person who prints or binds books.
  2. A person who compiles books from the writings of others.
  3. A person (or a business) who calculates odds and accepts bets, especially on horse racing; a bookie.

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