Tosh from a protester? (3)

I believe the answer is:

rot

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'tosh' is the 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?

'from a protester?' is the wordplay.
'from' says the answer is hidden in the clue.
'ROT' is hidden in the letters of 'protester'.

Can you help me to learn more?

(Other definitions for rot that I've seen before include "Decomposition" , "Informal nonsense" , "SECOND PART OF 25" , "Putrefy" , "Rhubarb" .)

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