It works without wires! (5)

I believe the answer is:

radio

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'it works without wires' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for radio that I've seen before include "Receiving apparatus" , "Electronic receiver" , "Broadcaster" , "listening device" , "send a message" .)

I've seen this clue in the Evening Standard.

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