The most common and most likely answer to this crossword clue is the 6 plus 8 letter word RECORD BREAKING
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Buddy explains!
The straight part
We know that "surpassing usual limits" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case surpassing usual limits = record breaking.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 RECORD BREAKING mean?
RECORD BREAKING adjective- Of an achievement, exceeding the highest previously recorded level in that activity.