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A ropy sort of restriction (6)

Ross

I believe the answer is:

tether

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This might be a double definition.

'a ropy sort' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'restriction' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'of' is the link.

Can you help me to learn more?

(Other definitions for tether that I've seen before include "Bond" , "Rope to hobble grazing animal" , "Restricting rope, chain" , "Rope to fasten or restrain animal" , "Tie with rope or chain" .)

I've seen this clue in the Evening Standard.
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