Crossword Genius

Just disagreeable head is missing (8)

Ross

I believe the answer is:

rightful

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'just' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

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(Other definitions for rightful that I've seen before include "Proper - legitimate" , "According to justice" , "Legitimate, fitting" , "Having a legally established claim" , "Lawful" .)

I've seen this clue in The Times.
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