Jump leads to start all Leyland cars – that follows (7)
I believe the answer is:
salchow
'jump' is the definition.
(type of jump in figure skating)
'leads to start all leyland cars that follows' is the wordplay.
'leads to' says to take the initial letters.
'cars' becomes 'chow' (I can't justify this - if you can you should give a lot more credence to this answer).
'that follows' is a charade indicator (letters next to each other).
The first letters of 'start all leyland' is 'sal'.
'sal'+'chow'='SALCHOW'
Can you help me to learn more?
(Other definitions for salchow that I've seen before include "Jump with spins on ice" , "twisting leap" .)