The most common and most likely answer to this crossword clue is the 8 letter word BOBBLING
B
O
B
B
L
I
N
G
Buddy explains!
The straight part
We know that "making uncertain movement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making uncertain movement = bobbling.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 BOBBLING mean?
BOBBLING verb- To bob up and down.
- To make a mistake in.
- To roll slowly.