Playground items (6)
(Other definitions for seesaws that I've seen before include "Yo-yos" , "Playground games" , "Playthings in the park" , "Boards balanced on fulcrums, children's playthings" , "Pieces of playground furniture" .)
'playground items' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for swings that I've seen before include "What you lose on these, you'll gain on the roundabouts" , "Sways" , "What you might lose on them, you could gain on the roundabouts" , "Moves in a curve" , "Pieces of playground equipment" .)