The most common and most likely answer to this crossword clue is the 10 letter word HOT-HEADED
I've seen this crossword clue in The Guardian
H
O
T
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H
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A
D
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D
More clues leading to the result HOT-HEADED
Buddy explains!
The straight part
We know that "Fiery" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fiery = hot-headed.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 HOT-HEADED mean?
HOT-HEADED adjective- Pertaining to or characteristic of a hothead or hotheadedness; (of a person) easily excited or angered.