Crossword Genius

But they don't smooth out the sea roads (7)

Ross

I believe the answer is:

rollers

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'roads' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rollers that I've seen before include "expensive cars" , "Long heavy sea waves" , "They may be used to paint" .)

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