The most common and most likely answer to this crossword clue is the 5 letter word TYSON
T
Y
S
O
N
More clues leading to the result TYSON
- Tony Soprano shot a fighter
- Boxer beginning to train young lad
- Fighter at one time stony broke
- Boxer and sucker: time for fresh start
- Heavyweight biting ends of bushy ears?
- Fighter back on horse yet losing every second?
- Bloodthirsty Sonny, boxing champion once
- Heartless Teddy boy becomes boxing champ
- Inventor has time for Dutch boxer
- Name of boxer and some rottweilers!
Buddy explains!

The straight part
We know that "boxer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boxer = tyson.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.