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

The straight part
We know that "got the shakes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case got the shakes = quivered.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 QUIVERED mean?
QUIVERED verb- To shake or move with slight and tremulous motion; to tremble; to quake; to shudder; to shiver.
- Furnished with, or carrying, a quiver for arrows.
- Sheathed, as in a quiver.