Cryptic crossword clue
Usual trend left by river forming waves 9

The most common and most likely answer to this crossword clue is the 9 letter word UNDULATES

U
N
D
U
L
A
T
E
S

Buddy explains!

The straight part
We know that "waves" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case waves = undulates.
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 UNDULATES mean?

UNDULATES verb
  1. To cause to move in a wavelike motion.
  2. To cause to resemble a wave
  3. To move in wavelike motions.
  4. To appear wavelike.

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