Crossword Genius

Generous protection for drivers (6)

Ross

I believe the answer is:

bumper

I'm a little stuck... Click here to teach me more about this clue!

'generous protection' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bumper that I've seen before include "end on a car" , "Part of a car" , "Protective vehicle bar" , "Race for young horses" , "Unusually plentiful as a crop may be" .)

I've seen this clue in The Globe and Mail.
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