Current fashion or style (4)
I believe the answer is:
This clue is a double definition.
'current fashion' is the first definition.
(I've seen this in another clue)
'style' is the second definition.
(synonyms)
(Other definitions for mode that I've seen before include "Fashion; way of performing" , "Fashion - look" , "Way of operation" , "Trend" , "Form or style" .)