Hunk and date aboard toboggan wrapped up warm (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

WAD (hunk?) + D (abbreviation for date), contained in (aboard) SLED (toboggan). “Wad” and “hunk” can both mean “lump”, but I’m not sure they’re interchangeable; “wad” usually means something loose (such as hay or rags) pushed together into a tight bundle, and “hunk” means a rough piece cut off a larger solid mass (such as bread or cheese).