Crossword Genius

Examine underground laboratory item (4,4)

Ross

I believe the answer is:

test tube

'laboratory item' is the definition.
(I've seen this before)

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

(Other definitions for test tube that I've seen before include "item of scientific use?" , "Scientist's cylindrical glass" , "used by chemist" , "Chemistry lab item" , "Hollow cylinder for the laboratory" .)

I've seen this clue in The Times and The Sun.
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