One receiving hidden signals making inroads with traitors? (10,5)

I believe the answer is:

transistor radio

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'one receiving hidden signals' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'making inroads with traitors?' is the wordplay.
'making' is an anagram indicator.
'with' says to put letters next to each other.
'inroads' put after 'traitors' is 'traitorsinroads'.
'traitorsinroads' is an anagram of 'TRANSISTOR RADIO'.

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I've seen this clue in The Independent.

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