The most common and most likely answer to this crossword clue is the 6 letter word BARKER
I've seen this crossword clue in The Times
B
A
R
K
E
R
More clues leading to the result BARKER
Buddy explains!

The straight part
We know that "someone to attract punters to show" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case someone to attract punters to show = barker.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 BARKER mean?
BARKER noun- Someone or something who barks.
- A person employed to solicit customers by calling out to passersby, e.g. at a carnival.
- A shelf-talker.
- A video game mode where the action is demonstrated to entice someone to play the game.
- A pistol.
- The spotted redshank.
- A person who removes needed or valuable tree bark, as on a cinnamon or cinchona plantation.
- A tanner.
- A machine used to remove unneeded bark from wood.