Trendy greeting in Cricket Club (4)
I believe the answer is:
chic
'trendy' is the definition.
(I've seen this before)
'greeting in cricket club' is the wordplay.
'greeting' becomes 'hi' (hi is a kind of greeting).
'in' means one lot of letters goes inside another.
'cricket club' becomes 'cc' (cricketing abbreviation).
'hi' put within 'cc' is 'CHIC'.
(Other definitions for chic that I've seen before include "Elegantly fashionable" , "A la mode" , "Elegantly stylish" , "Stylish and elegant - in France" , "Smart and stylish, in a French kind of way" .)