Country gent oddly evil (6)
I believe the answer is:
malign
'evil' is the definition.
(I know that evil can be written as malign)
'country gent oddly' is the wordplay.
'country' becomes 'mali' (Mali is an example).
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternating letters of 'gent' are 'gn'.
'mali'+'gn'='MALIGN'
(Other definitions for malign that I've seen before include "Defame, vilify" , "Speak ill of (someone)" , "Evil, baleful" , "Speak bad of" , "Defame; harmful" .)