Toboggan emptied soil on boundary (6)
I believe the answer is:
sledge
'toboggan' is the definition.
(I've seen this before)
'emptied soil on boundary' is the wordplay.
'emptied' means to remove the middle letters.
'on' says to put letters next to each other.
'boundary' becomes 'edge' (synonyms).
'soil' with its centre removed is 'sl'.
'sl'+'edge'='SLEDGE'
(Other definitions for sledge that I've seen before include "Vehicle for travelling over snow" , "Vehicle for use in snow" , "Vehicle mounted on runners" , "Try rattling opposing players" , "Put cricketer off" .)