Stylishness (5)
'stylishness' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for flair that I've seen before include "Style, panache" , "Taste" , "Elan; panache" , "Talent; elegance" , "Bent" .)
(Other definitions for eclat that I've seen before include "French social distinction or success" , "Ostentation" , "Showy effect (Fr.)" , "Cleat (anag.)" , "Loud applause" .)