A touch of style (4)
I believe the answer is:
dash
This clue is a double definition.
'a touch' is the first definition.
(I have seen 'A touch' mean 'dash' so perhaps 'touch' could also mean 'dash')
'style' is the second definition.
('dash' can be a synonym of 'style')
'of' acts as a link.
(Other definitions for dash that I've seen before include "Destroy (hopes); run" , "Run quickly - little taste - hyphen" , "Stylish vigour; frustrate (hopes)" , "Sprint with elan" , "Morse feature" .)