Toboggan has new thrust (5)
I believe the answer is:
lunge
'thrust' is the definition.
(synonyms)
'toboggan has new' is the wordplay.
'toboggan' becomes 'luge' (synonyms).
'has' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'luge' going around 'n' is 'LUNGE'.
(Other definitions for lunge that I've seen before include "Sudden forward movement" , "Impulsive move" , "Sudden forward move" , "Charge" , "Fall upon" .)