Source of intense concentration (5)

I believe the answer is:

laser

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'source' is the definition.
(I have seen 'light source' mean 'laser' so perhaps 'source' could also mean 'laser')

I can't explain the remainder of the clue.

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(Other definitions for laser that I've seen before include "Optical device producing an intense beam of light" , "Scientific apparatus" , "Intense light generator" , "Device for concentrating light" , "scientific instrument" .)

I've seen this clue in The Globe and Mail.

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