The most common and most likely answer to this crossword clue is the 7 letter word RAFFLES
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More clues leading to the result RAFFLES
Buddy explains!

The straight part
We know that "Fictional thief/gambling enterprises" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fictional thief/gambling enterprises = raffles.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 RAFFLES mean?
RAFFLES noun- A drawing, often held as a fundraiser, in which tickets or chances are sold to win a prize.
- A game of dice in which the player who throws three of the same number wins all the stakes.
- To award something by means of a raffle or random drawing, often used with off.
- To participate in a raffle.