Toboggan you need to pull with energy (4)
I believe the answer is:
luge
'toboggan' is the definition.
('luge' can be a synonym of 'toboggan')
'to pull with energy' is the wordplay.
'to pull' becomes 'lug' (I've seen this before**).
'with' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mcu).
'lug'+'e'='LUGE'
'you need' is the link.
(Other definitions for luge that I've seen before include "Form of transport" , "Racing sled for one or two people" , "Toboggan used in the Winter Olympics" , "Winter sport" , "Glue (anag) - racing toboggan" .)