Expose oneself to light for the cameraman (5)
I believe the answer is:
flash
'expose' is the definition.
(I know that flash is a type of expose)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for flash that I've seen before include "Short gleam of light" , "Momentary brightness" , "Camera fitment" , "Twinkling" , "Mo" .)