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Laboratory glass for experiment underground? (4,4)

Ross

I believe the answer is:

test tube

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

'laboratory glass' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'experiment underground?' is the wordplay.
'experiment' becomes 'test' (test is a kind of experiment).
'underground?' becomes 'tube' (the London Underground is nicknamed the Tube).
'test'+'tube'='TEST-TUBE'

'for' is the link.

Can you help me to learn more?

(Other definitions for test tube that I've seen before include "Small glass cylinder with one end closed, used in laboratory" , "Ling glass cylinder used in laboratories" , "item of scientific use?" , "Factor in experimental procedure" , "Lab vessel" .)

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