What does the cryptic crossword clue "Vital sack for heater (8,4)" 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.

Vital sack for heater (8,4)

Guardian Cryptic #29824 | 14 Across | 2025-10-13 flower

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