Radical to pash yokel (7)
I believe the answer is:
redneck
'pash yokel' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'radical to' is the wordplay.
'radical' becomes 'red' (red can informally mean communist).
'to' becomes 'neck' (I can't justify this - if you can you should give a lot more credence to this answer).
'red'+'neck'='REDNECK'
Can you help me to learn more?
(Other definitions for redneck that I've seen before include "Poor white American" , "Poor white called this" , "Ignorant bigot" , "Intolerant American" , "S. US working-class white conservative (derog.)" .)