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

The straight part
We know that "Hurting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hurting = twinging.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 TWINGING mean?
TWINGING verb- To pull with a twitch; to pinch; to tweak.
- To affect with a sharp, sudden pain; to torment with pinching or sharp pains.
- To have a sudden, sharp, local pain, like a twitch; to suffer a keen, darting, or shooting pain.