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Controlled backing for measuring leg cover (6)

Ross

I believe the answer is:

reined

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'controlled' is the definition.
(reining is a kind of controlling)

I can't explain the rest of the clue.

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(Other definitions for reined that I've seen before include "Stopped or slowed a horse" , "Pulled in, checked progress" , "Restrained" .)

I've seen this clue in The Irish Times.
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