Beginning to jump over a vehicle and a tree (9)
I believe the answer is:
jacaranda
'tree' is the definition.
(jacaranda is a kind of tree)
'beginning to jump over a vehicle and a' is the wordplay.
'beginning to' indicates taking the first letters.
'over' says to put letters next to each other.
'vehicle' becomes 'car' (car is a kind of vehicle).
The first letter of 'jump' is 'j'.
'j'+'a'+'car'+'and'+'a'='JACARANDA'
(Other definitions for jacaranda that I've seen before include "Tropical American tree" , "Tropical tree with fern-like leaves" , "exotic wood" , "Tree common in Pretoria, South Africa" , "Tropical flowering tree" .)