Rubbish from a protester (3)

I believe the answer is:

rot

'rubbish' is the definition.
(both can mean nonsense)

'from a protester' is the wordplay.
'from' says the answer is hidden in the clue.
'ROT' is hidden within 'protester'.

(Other definitions for rot that I've seen before include "Drivel" , "Decay, perish" , "Rubbish (colloq.)" , "Deteriorate" , "bunk" .)

I've seen this clue in the Evening Standard.

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