Jumping straight on funfair ride (5,5)
I believe the answer is:
ghost train
'funfair ride' is the definition.
(ghost train is a type of fairground ride)
'jumping straight on' is the wordplay.
'jumping' is an anagram indicator.
'straight'+'on'='straighton'
'straighton' with letters rearranged gives 'GHOST-TRAIN'.
(Other definitions for ghost train that I've seen before include "Spooky ride" , "scary ride" , "Fairground attraction" , "funfair ride" .)