Just what one is entitled to (5)
I believe the answer is:
right
'just' is the definition.
(similar in meaning)
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 "Fair or just" , "Morally correct" , "Morally good; rectify" , "Correct; appropriate" , "Quite proper" .)