Dress on street giving flash regularly (6)
I believe the answer is:
strobe
'flash regularly' is the definition.
(as in a strobelight)
'dress on street' is the wordplay.
'dress' becomes 'robe' (robing is a kind of dressing).
'on' is a charade indicator (letters next to each other).
'street' becomes 'st'.
'robe' after 'st' is 'STROBE'.
'giving' is the link.
(Other definitions for strobe that I've seen before include "Sister to Hansel" , "Protestant reformer" , "Rapidly flashing lighting often used on stage" , "Light that seems to spin" , "Flashing lamp" .)