Tommy's tosh? (3)

I believe the answer is:

rot

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This could be a double definition.

'tommy's' is the first definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'tosh?' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for rot that I've seen before include "Deterioration" , "Garbage" , "Drivel" , "Decay - rubbish" , "bunk" .)

I've seen this clue in the Evening Standard.

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