Cryptic crossword clue
Toughest weight: that is, for boxing? 8

The most common and most likely answer to this crossword clue is the 8 letter word CHEWIEST

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "Toughest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case toughest = chewiest.
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 CHEWIEST mean?

CHEWIEST adjective
  1. Having a pliable or springy texture when chewed.

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