The most common and most likely answer to this crossword clue is the 9 letter word SWELTERED
I've seen this crossword clue in The Guardian
S
W
E
L
T
E
R
E
D
More clues leading to the result SWELTERED
Buddy explains!

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 SWELTERED mean?
SWELTERED verb- To suffer terribly from intense heat.
- To perspire greatly from heat.
- To cause to faint, to overpower, as with heat.