Strong expression of public anger revealed as occasionally corny (6)
I believe the answer is:
outcry
'strong expression of public anger' is the definition.
(I've seen this before)
'revealed as occasionally corny' is the wordplay.
'revealed as' becomes 'out' (as in news which is out. I am not sure about the 'as' bit.).
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
The alternate letters of 'corny' are 'cry'.
'out'+'cry'='OUTCRY'
Can you help me to learn more?
(Other definitions for outcry that I've seen before include "Sea eagle" , "Anguished chorus" , "Public clamour" , "Great fuss" , "Widespread protest - clamour" .)