Tosh from a protester? (3)

I believe the answer is:

rot

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'tosh' is the definition.
The answer and definition 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' indicates the answer is hidden within the clue.
'ROT' is hidden within '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" .)

I've seen this clue in the Evening Standard.

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