What does the cryptic crossword clue "Key worker is involved in exercise after Tuesday's vacation (6)" 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.

Key worker is involved in exercise after Tuesday's vacation (6)

Guardian Cryptic #28981 | 1 Down | 2023-01-31

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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

IS in PT (exercise) after T[uesda]Y

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Key worker is involved in exer­cise after Tuesday's vacation (6)

Key worker is involved in exercise after Tuesday's vacation (6)