One can roll or ramble around (6)
I believe the answer is:
marble
'one can roll' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'ramble around' is the wordplay.
'around' is an anagram indicator.
'ramble' is an anagram of 'MARBLE'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for marble that I've seen before include "Hard shiny stone used by sculptors" , "Glass ball; stone" , "Decorative stone - ball" , "Type of rock" , "Hard crystalline limestone used for sculptures" .)