The most common and most likely answer to this crossword clue is the 9 letter word SCORCHING
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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 = scorching.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 SCORCHING mean?
SCORCHING verb- To burn the surface of something so as to discolour it
- To wither, parch or destroy something by heat or fire, especially to make land or buildings unusable to an enemy
- (To cause) to become scorched or singed
- To move at high speed (so as to leave scorch marks on the ground, physically or figuratively).
- To burn; to destroy by, or as by, fire.
- To attack with bitter sarcasm or virulence.
- To ride a bicycle furiously on a public highway.
- The act or result of something being scorched.
- Very hot.
- Bitterly sarcastic; scathing; withering.
- (Of speed when driving, running, etc.) very high.