Trend (7)
'trend' is the definition.
(I know that fashion is a type of trend)
This is all the clue.
(Other definitions for fashion that I've seen before include "Ton" , "Current popular style" , "Make; popular trend" , "Vogue, trend" , "Haute couture" .)
'trend' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mode that I've seen before include "Fashion - look" , "Custom" , "Style, method" , "'Fashion, style (4)'" , "Way of operation" .)