What does the cryptic crossword clue "Extremes of toil involved in task, crack up (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Extremes of toil involved in task, crack up (7)

Telegraph Prize Cryptic #3249 | 20 Down | 2024-01-28 flower

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