The most common and most likely answer to this crossword clue is the 6 letter word STUFFY
I've seen this crossword clue in The Sunday Telegraph
S
T
U
F
F
Y
More clues leading to the result STUFFY
Buddy explains!
The straight part
We know that "close" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case close = stuffy.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 STUFFY mean?
STUFFY noun- A toy made of a soft material, usually stuffed with cotton, straw, beans, or other materials, and typically intended as a plaything for children.
- Poorly ventilated; partially plugged.
- Stout; mettlesome; resolute.
- Angry and obstinate; sulky.
- Boring, uninteresting, over-formal, pompous, very conventional.
- Stout; sturdy.