Fairground slide (6-7)
I believe the answer is:
helter-skelter
'fairground slide' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for helter-skelter that I've seen before include "Pell-mell" , ""Amusement" ride - in a confused hurry" , "High spiral slide at fairground" , "Slapdash - fairground ride" , "Fairground attraction" .)