Slovenian actor surprisingly chatty (14)
I believe the answer is:
conversational
'chatty' is the definition.
(thesaurus)
'slovenian actor surprisingly' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'slovenian'+'actor'='slovenianactor'
'slovenianactor' with letters rearranged gives 'CONVERSATIONAL'.
(Other definitions for conversational that I've seen before include "a manner of speaking" , "relaxed" , "Like chatting" , "Fond of a chat" .)