Entitlement to only one sock? (5)

I believe the answer is:

right

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'entitlement' is the definition.
(right can mean an entitlement to something)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for right that I've seen before include "Morally defensible" , "Correct; political wing" , "''The customer is always .....''" , "licence" , "Not left" .)

I've seen this clue in the Evening Standard.

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