Crossword Genius

See note (4,4)

Ross

There are a few possibilities for this:

test tube

very well used cars very good twin town turn tail walk away vice ring unit cost west bank wage bill warp beam wing back

(Other definitions for test tube that I've seen before include "Factor in experimental procedure" , "Item used in chemical reactions" , "birthplace of science" , "Experimental glassware" , "useful for experiment" .)

I've seen this clue in The Independent.
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