Flash from dress seen on street (6)
I believe the answer is:
strobe
'flash' is the definition.
(flashing light)
'dress seen on street' is the wordplay.
'dress' becomes 'robe' (robing is a kind of dressing).
'seen on' means one lot of letters go next to another.
'street' becomes 'st' (abbreviation).
'robe' after 'st' is 'STROBE'.
'from' is the link.
(Other definitions for strobe that I've seen before include "High-intensity flashing beam of light" , "something flashy" , "Protestant reformer" , "Flashing disco light" , "Flasher" .)