The most common and most likely answer to this crossword clue is the 9 letter word REPECHAGE
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More clues leading to the result REPECHAGE
Buddy explains!
The straight part
We know that "Extra heat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extra heat = repechage.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 REPECHAGE mean?
REPECHAGE noun- A heat (as in rowing or fencing) in which the best competitors who have lost in a previous round compete for a place or places yet left in the next round.