Light street clothing (6)
I believe the answer is:
strobe
'light' is the definition.
(strobe light is a type of light)
'street clothing' is the wordplay.
'street' becomes 'st' (abbreviation).
'clothing' becomes 'robe' (robe is a kind of clothing).
'st'+'robe'='STROBE'
(Other definitions for strobe that I've seen before include "Sorbet (anag) -flashing light" , "Flashing, very bright beam" , "Protestant reformer" , "Flash on and off" , "High-intensity flashing beam of light" .)