Edges left out of playground features (5)
I believe the answer is:
sides
This clue could be a double definition.
'edges left out of playground' is the first definition.
'sides' can be an answer for 'edges' (I've seen this before). I am unsure of the 'left out of playground' bit.
'features' is the second definition.
(side is a kind of feature)
(Other definitions for sides that I've seen before include "camps" , "Faces" , "Flanks, or opposing teams" , "Lines" , "Opposing factions or facets" .)