Crossword Genius

Staunch supporter of glass (4)

Ross

I believe the answer is:

stem

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This clue might be a double definition.

'staunch' is the first definition.
(synonyms)

'supporter of glass' is the second definition.
'stem' can be an answer for 'supporter' (I've seen this before). I am not sure about the 'of glass' bit.

Can you help me to learn more?

(Other definitions for stem that I've seen before include "Basic skiing turn" , "race" , "Restrain - staunch - supporter" , "Peduncle" , "supporter of flag, for example" .)

I've seen this clue in The Daily Mail.
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