The most common and most likely answer to this crossword clue is the 8 letter word SPICIEST
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More clues leading to the result SPICIEST
Buddy explains!

The straight part
We know that "Hottest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hottest = spiciest.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 SPICIEST mean?
SPICIEST adjective- Of, pertaining to, or containing spice.
- (of flavors) Provoking a burning sensation due to the presence of chilis or similar hot spices
- (of flavors or odors) Tangy, zesty, or pungent.
- (of expression or behavior) Vigorous; colorful; stimulating.
- Risqué, sexy, racy; mildly pornographic.