Cordial (8)
I believe the answer is:
amicable
'cordial' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for amicable that I've seen before include "Friendly, peaceable" , "Friendly, good-humoured" , "Friendly, reasonable" , "Easy to approach" , "Friendly, nonthreatening" .)