Light beam that's very strong (5)

I believe the answer is:

laser

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'light beam' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for laser that I've seen before include "Coherent light-beam" , "Device producing thin beam of light" , "Device that generates an intense beam of light" , "E.g. surgical light-beam" , "Beam (used in surgery)" .)

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

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