Cutting beams (6)
I believe the answer is:
lasers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cutting beams</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lasers that I've seen before include "Optical devices" , "Light beam devices" , "Intense beams of light" , "Light amplifications by stimulated emissions of radiation" .)