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In many ways, a legal entitlement (4)

Ross

I believe the answer is:

lien

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This clue could be a double definition.

'in many ways' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'a legal entitlement' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for lien that I've seen before include "The right to take property if an obligation is not met" , "Legal claim on Nile" , "Security for a debt" , "Sequestration order" , "Legal claim on the property of another" .)

I've seen this clue in the Evening Standard.
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