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Power source (4)

Ross

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4

7 9 4* 5,4

'power source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for atom that I've seen before include "It was once thought to be smallest particle of matter" , "Smallest particle in an element able to take part in a chemical reaction" , "Tiny particle, great bomb" , "A tiny particle of matter with a big bang" , "little amount" .)

I've seen this clue in The Mirror, The Star Tribune, the Penny Press, The New York Times and The Wall Street Journal.
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