Heard pianist Charles croon - going fast (6)
I believe the answer is:
'going fast' is the definition.
(to race is to go fast)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for racing that I've seen before include "Dashing" , "Running fast" , "Competing in speed contest" , "Epsom, Aintree sport" , "Sport; moving swiftly" .)