The most common and most likely answer to this crossword clue is the 6 letter word BARKED
I've seen this crossword clue in Financial Times
B
A
R
K
E
D
More clues leading to the result BARKED
Buddy explains!

The straight part
We know that "boxer perhaps did" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boxer perhaps did = barked.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 BARKED mean?
BARKED verb- To make a short, loud, explosive noise with the vocal organs (said of animals, especially dogs).
- To make a clamor; to make importunate outcries.
- To speak sharply.
- To strip the bark from; to peel.
- To abrade or rub off any outer covering from.
- To girdle.
- To cover or inclose with bark, or as with bark.
- (in combination) Having the specified kind of bark.