The most common and most likely answer to this crossword clue is the 5 plus 1 letter word LOLL} :
I've seen this crossword clue in The Daily Telegraph
L
O
L
L
}
:
Buddy explains!

The straight part
We know that "lounge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lounge = loll} :.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 LOLL} : mean?
LOLL} : verb- To act lazily or indolently while reclining; to lean; to lie at ease.
- To hang extended from the mouth, like the tongue of an animal heated from exertion.
- To let (the tongue) hang from the mouth in this way.