Crossword Genius

Supporter of glass company plant (7)

Ross

I believe the answer is:

coaster

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

'supporter of glass' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'company plant' is the wordplay.
'company' becomes 'co' (abbreviation).
'plant' becomes 'aster' (aster is a kind of plant).
'co'+'aster'='COASTER'

Can you help me to learn more?

(Other definitions for coaster that I've seen before include "It goes under a schooner, perhaps" , "Ship; (drinks) mat" , "on which some mug may be made to stand?" , "Small ship or beer mat" , "Mat to protect a table" .)

I've seen this clue in The Times.
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