Rock icon from Jamaica cut bass jams (6)
I believe the answer is:
marble
'rock' is the definition.
(I know that marble is a type of rock)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for marble that I've seen before include "Small ball of glass used in games" , "Decorative stone - ball" , "Fine stone" , "Glass ball; stone" , "Hard crystalline limestone used for sculpture" .)