He cuts up the slides (6)
I believe the answer is:
chutes
'the slides' is the definition.
('chute' can be a synonym of 'slide')
'he cuts up' is the wordplay.
'up' indicates anagramming the letters (letters get chucked up).
'he'+'cuts'='hecuts'
'hecuts' is an anagram of 'CHUTES'.
(Other definitions for chutes that I've seen before include "Sloping channels or slides" , "Sloping channels through which things can be poured or dropped" .)