À la mode (7)
'a la mode' is the definition.
(synonyms)
This is all the clue.
(Other definitions for stylish that I've seen before include "Imposingly smart" , "Smart - attractively competent" , "Fashionable, a la mode" , "Chic -- fashionable" , "Trendy" .)
(Other definitions for pie that I've seen before include "Pastry crust with filling" , "Filled pastry" , "See 6" , "Dish baked in pastry-lined pan" , "In the sky, this is wishful thinking" .)