Raced round conifer (5)
I believe the answer is:
cedar
'conifer' is the definition.
(I know that cedar is a type of conifer)
'raced round' is the wordplay.
'round' indicates an anagram.
'raced' is an anagram of 'CEDAR'.
(Other definitions for cedar that I've seen before include "Cypress-like tree" , "Great hardwood tree associated with Lebanon" , "Tall conifer" , "Tree giving fragrant wood" , "Evergreen tree" .)