The most common and most likely answer to this crossword clue is the 8 letter word RECOILED
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More clues leading to the result RECOILED
Buddy explains!

The straight part
We know that "Sprang back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sprang back = recoiled.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 RECOILED mean?
RECOILED verb- To pull back, especially in disgust, horror or astonishment.
- To retreat before an opponent.
- To retire, withdraw.
- (of a firearm) To quickly push back when fired