The most common and most likely answer to this crossword clue is the 9 letter word UNDULATED
U
N
D
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L
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D
Buddy explains!

The straight part
We know that "rose and fell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rose and fell = undulated.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 UNDULATED mean?
UNDULATED verb- To cause to move in a wavelike motion.
- To cause to resemble a wave
- To move in wavelike motions.
- To appear wavelike.