Cordial, amiable (8)
I believe the answer is:
friendly
I believe this clue is a double definition.
'cordial' is the first definition.
(similar in meaning)
'amiable' is the second definition.
(similar in meaning)
(Other definitions for friendly that I've seen before include "on the same side" , "Affable" , "Amicable and kindly" , "Kind, pleasant" , "such a society" .)