The most common and most likely answer to this crossword clue is the 8 letter word CHOMPING
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Buddy explains!

The straight part
We know that "Intensely biting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case intensely biting = chomping.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 CHOMPING mean?
CHOMPING verb- To bite or chew loudly or heavily.
- (Perl) To remove the final character from (a text string) if it is a newline (or, less commonly, some other programmer-specified character).
- The sound or action of one who chomps.