Picture of a hair accessory (5)
I believe the answer is:
slide
'picture' is the definition.
(slide is a kind of picture)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for slide that I've seen before include "Transparency" , "leading to a fall" , "Microscope glass" , "Trombone part" , "Make mild fun of" .)