Provoke when seen, we hear (6)
I believe the answer is:
incite
'provoke' is the definition.
(I know that incite is a more specific form of the action provoke)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for incite that I've seen before include "Provoke - stimulate" , "Provoke, set off" , "Encourage or stir up" , "Prompt" , "Provoke to action" .)