Stone from nursery's borders carried by cattle ... (4)
I believe the answer is:
onyx
'stone' is the definition.
(type of gemstone)
'nursery's borders carried by cattle' is the wordplay.
'borders' says to hollow out the word (remove centre letters) (only the edge or border letters remain).
'carried by' indicates putting letters inside.
'cattle' becomes 'ox' (ox is a kind of cattle).
'nursery' with its centre taken out is 'ny'.
'ny' put inside 'ox' is 'ONYX'.
'from' acts as a link.
(Other definitions for onyx that I've seen before include "Stones" , "Variety of agate used for making cameos" , "Cameo material" , "Form of chalcedony" , "Form of agate" .)