But it could be an entitlement to what's left (5)

I believe the answer is:

right

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'left' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

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

Can you help me to learn more?

(Other definitions for right that I've seen before include "Correct - claim allowed" , "The hand to the east when facing north" , "Legal entitlement" , "Correct; political wing" , "Most favourable" .)

I've seen this clue in the Evening Standard.

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