Dashes off to get sunglasses (6)
I believe the answer is:
shades
'sunglasses' is the definition.
('shades' can be a synonym of 'sunglasses')
'dashes off' is the wordplay.
'off' indicates an anagram.
'dashes' is an anagram of 'SHADES'.
'to get' acts as a link.
(Other definitions for shades that I've seen before include "Old ghosts or modern sunglasses" , "suspicions" , "'Tints, tones (6)'" , "Hip sunglasses or gloomy ghosts" , "blinds?" .)