A two-word phrase for a glass vessel used to hold or mix substances for a scientific experiment. Keep in mind: The first word may be at the bottom.
Reveal top + bottom answer and reasoning
Answer: TEST TUBE
Top half: TEST - TEST is the first half of "test tube", the top + bottom answer for the shared final clue: "A two-word phrase for a glass vessel used to hold or mix substances for a scientific experiment. Keep in mind: The first word may be at the bottom".
Bottom half: TUBE - TUBE completes "test tube", so the top and bottom rows answer the shared final clue together.