Ring road extremely busy? I can’t answer that (6)

I believe the answer is:

bypass

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

'ring road' is the definition.
(I know that ring road can be written as bypass)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bypass that I've seen before include "operation to improve circulation" , "What avoids Newbury" , "Ignore" , "Road avoiding crowded centres" , "Round-about way" .)

I've seen this clue in The Times.

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