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Communication
made
meaningless
by
this
climber
(9)
Communication made meaningless by this climber (9)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition: Communication made meaningless by this describes a scrambler, a device that renders messages unintelligible. The second definition, climber, refers to a scrambler as a scrambling/climbing plant or off-road machine.