What does the cryptic crossword clue "Support power source, not initially atomic (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.

Support power source, not initially atomic (4)

Guardian Cryptic #29396 | 18 Across | 2024-05-30

Generating...

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

STEAM less A[tomic]

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