The most common and most likely answer to this crossword clue is the 10 letter word MAKEWEIGHT
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More clues leading to the result MAKEWEIGHT
Buddy explains!
The straight part
We know that "What boxer must do before bou/t/someone unimportant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what boxer must do before bou/t/someone unimportant = makeweight.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 MAKEWEIGHT mean?
MAKEWEIGHT noun- Something of inferior quality which is included in a shipment to make up the weight.
- Something included to add to the apparent weight or force of an argument.