Crossword Genius

Experimental equipment for examination underground (4,4)

Ross

I believe the answer is:

test tube

'experimental equipment' is the definition.

'examination underground' is the wordplay.
'examination' becomes 'test' ('test' can be a synonym of 'examination').
'underground' becomes 'tube' ('tube' can be a synonym of 'underground').
'test'+'tube'='TEST-TUBE'

'for' is the link.

(Other definitions for test tube that I've seen before include "Item of laboratory equipment" , "Laboratory instrument" , "glass vessel" , "Hollow cylinder for the laboratory" , "Ling glass cylinder used in laboratories" .)

I've seen this clue in The Guardian.
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