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

The straight part
We know that "Hot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hot = scalding.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 SCALDING mean?
SCALDING verb- To burn with hot liquid.
- To heat almost to boiling.
- An instance of scalding: a burn.
- (of a liquid) Hot enough to burn.
- 3,5-methoxy-4-ethoxyphenethylamine, a psychedelic drug and entheogen of the phenethylamine class.