Tobogganist perhaps starting to sprint to top and show hesitation (6)
I believe the answer is:
slider
'tobogganist' is the definition.
(someone sliding on a toboggan)
'starting to sprint to top and show hesitation' is the wordplay.
'starting to' says to take the initial letters.
'to top' becomes 'lid' (lid is a kind of top).
'and' says to put letters next to each other.
'show hesitation' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letter of 'sprint' is 's'.
's'+'lid'+'er'='SLIDER'
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for slider that I've seen before include "Sir led (anag) - control mechanism" , "American snack" , "Control such as on a mixing desk" , "Control knob move up and down or sideways" , "Eg, fader control" .)