Agitator trots peer out (9)
I believe the answer is:
'agitator' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'trots peer out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'trotspeer' anagrammed gives 'PROTESTER'.
Can you help me to learn more?
(Other definitions for protester that I've seen before include "objector" , "Dissident" , "Demonstrator" , "Demonstrating kind" , "Person, we hear, not content" .)