Bearman ultimately lapped by good racer? (5)
I believe the answer is:
snake
'racer?' is the definition.
(racer is a kind of snake)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for snake that I've seen before include "former EC currency band" , "Carnivorous reptile" , "Part of plant or hair" , "Asp, perhaps?" , "Long slender reptile" .)