Pretty entertaining start to high jump (5)
I believe the answer is:
chute
'jump' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'pretty entertaining start to high' is the wordplay.
'pretty' becomes 'cute' (both can mean attractive).
'entertaining' is an insertion indicator.
'start to' indicates taking the first letters.
The first letter of 'high' is 'h'.
'cute' placed around 'h' is 'CHUTE'.
Can you help me to learn more?
(Other definitions for chute that I've seen before include "Slide" , "Inclined channel for rubbish, laundry etc" , "Sloping trough" , "Sloping channel" , "Flume" .)