Eloquent, silver-tongued (6)
I believe the answer is:
fluent
This clue is a double definition.
'eloquent' is the first definition.
(I know that eloquent can be written as fluent)
'silver-tongued' is the second definition.
(I know that silver-tongued can be written as fluent)
(Other definitions for fluent that I've seen before include "Good at speaking (a foreign language?)" , "well able to interpret" , "Eloquent, silver-tongued" , "Of speech, smooth and eloquent" , "Able to speak smoothly and readily" .)