Crossword Genius

Cycling without restriction rocks? (4)

Ross

I believe the answer is:

reef

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'rocks?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for reef that I've seen before include "Atoll protector" , "Low-lying coral ridge" , "Rocks in shallow water - kind of knot" , "Ridge of rock or sand just below sea surface" , "Ridge of rock underwater" .)

I've seen this clue in The Telegraph.
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