Toboggan full of crack in bags (7)
I believe the answer is:
luggage
'bags' is the definition.
(I've seen this before)
'toboggan full of crack' is the wordplay.
'toboggan' becomes 'luge' (synonyms).
'full of' means one lot of letters goes inside another.
'crack' becomes 'gag' (both can mean a joke).
'luge' placed around 'gag' is 'LUGGAGE'.
'in' acts as a link.
(Other definitions for luggage that I've seen before include "Suitcases, bags, etc" , "Impedimenta" , "Travelling cases" , "Bags of the traveller" , "Trunks and cases of traveller" .)