The most common and most likely answer to this crossword clue is the 8 letter word GAMESTER
I've seen this crossword clue in The Guardian
G
A
M
E
S
T
E
R
More clues leading to the result GAMESTER
- Sick mare gets better
- East Germany changed, though not any better
- East Germany without any changes for the better
- Player in Rangers team ran off before misbehaving
- Small move for Oval’s unloved landmark could be better
- Better fiddle gas meter!
- Better teams possibly in Germany? Not a lot
- Finally, malfunctioning steamer's working better
Buddy explains!

The straight part
We know that "better" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case better = gamester.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 GAMESTER mean?
GAMESTER noun- A person who plays games.
- One who plays video games.
- A gambler.
- A prostitute; one who is on the game.