Affected stylish greeting (6)
I believe the answer is:
chichi
'affected' is the definition.
(thesaurus)
'stylish greeting' is the wordplay.
'stylish' becomes 'chic' ('chic' can be similar in meaning to 'stylish').
'greeting' becomes 'hi' (hi is a kind of greeting).
'chic'+'hi'='CHICHI'
(Other definitions for chichi that I've seen before include "Pretentiously stylish" , "self-consciously stylish" , "Pretentious" , "Affectedly stylish" , "Very smart and sophisticated" .)