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Set apart, ten gears for cycling (8)

Ross

I believe the answer is:

estrange

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'set apart' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for estrange that I've seen before include "turn away?" , "Cause to become unfriendly using reagents" , "split up?" , "Make bad friends with sergeant" , "Lose friendship" .)

I've seen this clue in The Telegraph.
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