The most common and most likely answer to this crossword clue is the 6 letter word TUMBLE
T
U
M
B
L
E
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The straight part
We know that "Roll over" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case roll over = tumble.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 TUMBLE mean?
TUMBLE noun- A fall, especially end over end.
- A disorderly heap.
- An act of sexual intercourse.
- To fall end over end; to roll over and over.
- To perform gymnastics such as somersaults, rolls, and handsprings.
- To drop rapidly.
- To smoothe and polish, e.g., gemstones or pebbles, by means of a rotating tumbler.
- To have sexual intercourse.
- To move or rush in a headlong or uncontrolled way.
- To muss, to make disorderly; to tousle or rumple.
- (cryptocurrency) To obscure the audit trail of funds by means of a tumbler.