The most common and most likely answer to this crossword clue is the 4 letter word LIDO
L
I
D
O
More clues leading to the result LIDO
Buddy explains!
The straight part
We know that "open-air swimming pool" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case open-air swimming pool = lido.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 LIDO mean?
LIDO noun- Part of the sea by a beach sectioned off for swimming and other aquatic activities.
- An outdoor swimming pool.