Easy to take at top speed! (5)
I believe the answer is:
light
'easy' is the definition.
(I know that easy can be written as light)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for light that I've seen before include "free gift from The Sun" , "guide in the dark" , "Mild" , "Portable" , "Easily lifted" .)