Imprisoned fox? (3)

I believe the answer is:

con

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'imprisoned fox?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

This is all the clue.

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(Other definitions for con that I've seen before include "Deceive; convict (colloq.)" , "Swindle after winning trust" , "Tory" , "Peruse carefully or swindle" , "Study; steer" .)

I've seen this clue in the Evening Standard.

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