Cut hardwood to line toboggan (7)
I believe the answer is:
slashed
'cut' is the definition.
(I know that cut can be written as slashed)
'hardwood to line toboggan' is the wordplay.
'hardwood' becomes 'ash' (I've seen this before).
'to line' is an insertion indicator.
'toboggan' becomes 'sled' (toboggan is a type of sled).
'ash' put into 'sled' is 'SLASHED'.
(Other definitions for slashed that I've seen before include "Cut or gashed with knife, being hassled" , "vandalised?" .)