Kids’ new slide (4)
I believe the answer is:
skid
'slide' is the definition.
(I know that slide can be written as skid)
'kids' new' is the wordplay.
'new' indicates an anagram.
'kids' anagrammed gives 'SKID'.
(Other definitions for skid that I've seen before include "Slither out of control" , "Slide sideways" , "Slip on wet ground" , "What car may do on ice - be careful" , "Slide (on slippery ground)" .)