Country walk with first half climbing attractive rock (6)
I believe the answer is:
marble
'rock' is the definition.
(marble is a kind of rock)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for marble that I've seen before include "Glass ball toy" , "Crystalline limestone often used by sculptors" , "Fine stone" , "Ramble (anag.)" , "Hard crystalline limestone used for sculptures" .)