Crossword Genius

Surface of cycle path . . . (5)

Ross

I believe the answer is:

outer

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'surface' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for outer that I've seen before include "Route (anag.)" , "External kind of route" , "Ring for double scores on a dartboard" , "Archer's shot" , "External; peripheral" .)

I've seen this clue in The Guardian.
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