What does the cryptic crossword clue "Device that decreases pure stress, or otherwise (7-5)" 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.

Device that decreases pure stress, or otherwise (7-5)

Telegraph Prize Cryptic #3137 | 16 Across | 2021-12-05 flower

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