What does the cryptic crossword clue "Unstable element so long emitting energy in empty room (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.

Unstable element so long emitting energy in empty room (6)

Times Cryptic #28590 | 20 Down | 2023-04-29

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