Disco flasher in bistro bedazzles (6)
I believe the answer is:
strobe
'disco flasher' is the definition.
(I've seen this in another clue)
'in bistro bedazzles' is the wordplay.
'in' indicates the answer is hidden within the clue.
'STROBE' is hidden within 'bistro bedazzles'.
(Other definitions for strobe that I've seen before include "Sort of lighting" , "Flashing-light device" , "something flashy" , "Flashing, very bright beam" , "Sister to Hansel" .)