Something to slip on, but not in bed (5,2,3)

I believe the answer is:

sheet of ice

I'm a little stuck... Click here to teach me more about this clue!

'slip on but not in bed' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'something to' is the wordplay.
I cannot really see how this works, but
'to' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.