Bad mood in toboggan, having made faltering progress (8)
I believe the answer is:
shuffled
'made faltering progress' is the definition.
(to shuffle is to move slowly)
'bad mood in toboggan' is the wordplay.
'bad mood' becomes 'huff' (someone 'in a huff' is in a bad mood).
'in' means one lot of letters goes inside another.
'toboggan' becomes 'sled' (toboggan is a type of sled).
'huff' put within 'sled' is 'SHUFFLED'.
'having' is the link.
(Other definitions for shuffled that I've seen before include "Mixed at random - shambled" , "Rearranged (cards)" , "Rearranged (a pack)" .)