Crossword Genius

Unlikely material for slippers, that's clear (5)

Ross

I believe the answer is:

glass

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

'unlikely material' is the definition.
'glass' can be an answer for 'material' (I have seen 'Vitreous material ' mean 'glass' so perhaps 'material' could also mean 'glass'). I am unsure of the 'unlikely' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for glass that I've seen before include "measure of wine" , "Balloon, say" , "Container for drinking from" , "Drinking vessel" , "Transparent solid" .)

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