The most common and most likely answer to this crossword clue is the 4 letter word FARO
I've seen this crossword clue in The Daily Telegraph
F
A
R
O
More clues leading to the result FARO
- Just one dropping round for card game
- Just one dropped round for gambling game
- Sound made by old Egyptian ruler's game
- Ring service about port
- Card game for a drunk
- Distant circle in gambling game
- Many miles off old Portuguese city
- Considerably old Portuguese port
- Card game for well-off circle
- Game for a flutter
Buddy explains!

The straight part
We know that "Portuguese city" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case portuguese city = faro.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 FARO mean?
FARO noun- A game of chance played by betting on the order in which certain cards will appear when taken singly from the top of the pack.