Persuasive county fellow? (6)
I believe the answer is:
cogent
'persuasive' is the definition.
(I've seen this before)
'county fellow?' is the wordplay.
'county' becomes 'co'.
'fellow?' becomes 'gent' ('gent' can be a synonym of 'fellow'**).
'co'+'gent'='COGENT'
(Other definitions for cogent that I've seen before include "Forceful - persuasive" , "Forceful and to the point" , "Clear, logical and convincing" , "Compelling or convincing" , "Powerful and convincing, argument say" .)