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For which low gear is highly reasonable (5)

Ross

I believe the answer is:

hills

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'for which low gear is highly reasonable' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for hills that I've seen before include "See 7" , "Heights; tors" , "Elevations of land" , "High terrain" , "Mounts" .)

I've seen this clue in the Evening Standard.
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