On a roll with navel piercing? (8)
I believe the answer is:
tumbling
'on' is the definition.
Although both the answer and definition are adjectives, I cannot understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tumbling that I've seen before include "Acrobatics" , "Falling down, as if collapsing" , "Falling headlong" , "Quickly declining" , "Rolling over and over, as a gymnast might" .)