The most common and most likely answer to this crossword clue is the 12 letter word STOCKBROKERS
I've seen this crossword clue in The Guardian
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More clues leading to the result STOCKBROKERS
Buddy explains!
The straight part
We know that "those dealing in securities" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case those dealing in securities = stockbrokers.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 STOCKBROKERS mean?
STOCKBROKERS noun- A person who buys and sells shares (stock) on a stock exchange on behalf of clients. May also provide investment advice and/or company information, depending on the level of service offered (or chosen by the client).