Crossword Genius

Certainly not free for cycling (4)

Ross

I believe the answer is:

nope

'certainly not' is the definition.
(I've seen this before)

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

(Other definitions for nope that I've seen before include "Negative response" , "You must be joking" , "not with stress" , "Certainly not" , "I'm afraid not" .)

I've seen this clue in The Independent.
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