The most common and most likely answer to this crossword clue is the 4 letter word ANTI
A
N
T
I
More clues leading to the result ANTI
- Not in favour of major road skirting edges of Newport
- Am I not able to save first opponent?
- Opposed to books being dumped in main road
- One who's against settling in Chiantishire
- One opposing article Congress rejected
- Opponent from Byzantium
- Opposition member’s article Congress backed
- Opponent's somewhat frantic
- Opposed to conservationists blocking artificial insemination
- Against one of 26’s companions abandoning wine
Buddy explains!

The straight part
We know that "rebel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rebel = anti.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 ANTI mean?
ANTI noun- A person opposed to a concept or principle.
- Opposed to something.
- That has a torsion angle between 90° and 180°
- Alternative form of anti-