Flash light? (6)
I believe the answer is:
'flash light?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for strobe that I've seen before include "High-intensity flashing beam of light" , "Sorbet (anag) -flashing light" , "Flashing disco light" , "Flashing-light device" , "Flashing lamp" .)