The most common and most likely answer to this crossword clue is the 8 letter word DESERVED
I've seen this crossword clue in Independent
D
E
S
E
R
V
E
D
More clues leading to the result DESERVED
Buddy explains!

The straight part
We know that "Just" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case just = deserved.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DESERVED mean?
DESERVED verb- To be entitled to, as a result of past actions; to be worthy to have.
- To earn, win.
- To reward, to give in return for service.
- To serve; to treat; to benefit.