Neddy to suffer from attack (6)
I believe the answer is:
assail
'attack' is the definition.
(I know that attack can be written as assail)
'neddy to suffer' is the wordplay.
'neddy' becomes 'ass' (I can't explain this - if you can you should believe this answer much more).
'to suffer' becomes 'ail' (ailing is a kind of suffering).
'ass'+'ail'='ASSAIL'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for assail that I've seen before include "Aggressively attack" , "Assault, attack" , "storm" , "Launch an attack" , "Charge" .)