Defamed Frenchman to sympathise with writer (8)
I believe the answer is:
maligned
'defamed' is the definition.
(maligning is a kind of defaming)
'frenchman to sympathise with writer' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'to sympathise with' becomes 'align' (I can't justify this - if you can you should believe this answer much more).
'writer' becomes 'ed' (I've seen this in other clues).
'm'+'align'+'ed'='MALIGNED'
Can you help me to learn more?
(Other definitions for maligned that I've seen before include "Defamed" , "Abused" , "Spoken ill of" , "stigmatised" , "Unjustly slandered" .)