hair clip (8)
(Other definitions for slide that I've seen before include "Playground item" , "Decline" , "Playground chute" , "leading to a fall" , "Picture" .)
'hair clip' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for barrette that I've seen before include "lock keeper" , "Barnet's additional beauty" .)