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.
Maybe they are linked in a way I don't understand?

'from a protester?' is the wordplay.
'from' indicates the answer is hidden within 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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